STIIDIES ON THE CRANE-F'LIES OF' MEXICO.
PART III.*(Order Diptera, Superfamily Tipuloidea).
CnenI-ss P. ArnxaNoen,
Amherst, I\f assachusetts.

The presentpaper is a further contribution to our knowledgeof the Mexican crane-flies. The preceding parts appeared in
1925and 1926 (Annals Ent.,Soc. America, 18: 341-362,Lg25;
19: 158-179,1926). The presentinstalment is based on theextensivecollectionsmade in the State of Chiapasduring 1926
by -y friend, Dr. Alfons Dampf, rn'hovery kindly allowed me
to retain the types of the novelties. The majority of thespecimensweresecuredin the vicinity of San Cristobal las Casas,
the former capital of Chiapas (altitude 2100 meters) and on
the neighboring ranges of the Zontehuitz and Moshbiquil
mountains, the highest altitude at which Tipulide were taken
being on the summit of the Zontehuitz, at an altitude of 2800
meters. Other large and representative serieswere secured atlower altitudes, at the Rancho Sabino Perez (altitude nearly
500 meters), Santa Lucia (altitude 575 meters) and San Isabel(altitude about 650 meters),making a notable contrast with thefauna of the high altitudes around San Cristobal. Still othercollectionswere made at Tonala, a station on the Pan-American
Railway, near the Pacific Ocean, and one of the hottest partsof the Mexican Republic (M. F. Nos. 930, 930a). The entire
collection,including more than 1000 specimens,is of the greatest possible value in the unusual number of records that it
includes.
The following Mexican Biocenosis (M. B.) and Mexican
Fauna (M. F.) numbers of the collector require the followitrg
summary. These and all others in the seriesare to be made thesubject of exhaustive memoirs on the Mexican fauna and flora
by the distinguished collector.
*Contribution from the Entomological Laboratory of the Massachusetts
Agricultural College.

301

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Annals Entomological

Hueitepec: swept in the dense leafy woods covering the
Hueitepec, near san cristobal, altitude 2600 meters. M. B.
170. Limonia lud,ibunda sp. n., as well as an undescribed
species of. Etephantomyia and the most northerly species yet
discovered of the Tipula monilifera group.
zontehuitz: Typical dense, damp virgin forest near thesummit of the Zontehaitz, altitude 2750 meters, in immense
numbers between the leaves of a Bromelia association. M. B.
t76. Dicranomyia exet@sp. n., Erioptera dam?fi sp. n., Molophilus fuscopleuralis sp. n.
san cristobal,; very nalTow, shadowy ravine of a small
mountain brook, falling in cascades from the Moshbiquil
mountain to the valley of San Cristobal, arising from a springsome 75 meters higher. M. B. 190, 190a. Gonomyia chi'apasensisSp.tr., Erioptera(Mesocyphona)apicinigra sp.n:,8. (I[)
siturota Sp. o., M.otophitusobediens sp. n.' and undescribed,
species of Geranomyia, Epiphragfna and Atarba, not discussed
at this time.
San f sabel: Altitude about 650 meters, near a swift flowing
brook; typical pine ridge vegetation; attracted bV ligh!._ M. F.
1057. hr;optt o (Eriiptera) guad,r'icincta sP.n., -4: (Emped'a)
stygia sp.n., E. (Mesocyphona)mod,icasp. n:, E. (M.) leucopasta
sp. n., Rhabd'omastir(Rhabdomastix)isabella sp. n.
Besidesthe novelties discussedherein, Dr. Dampf has added
most materially to our knowledge of distribution of previously
described forms. The most interesting feature of the Chiapas
collections might be considered the unusual development of
the subgenus Mesocyphona of.Erioptera Meigen' no fewer than
11 speciis having been taken on this expedition.
In the present report and others to be published under thistitle, the vlnation ol the radial field of the wing is materiallychanged. The detailed paper by the writer discussing thismodiication should be consulted (The interpretation of theradial field of the wing in the Nematocerous Diptera, withspecial referenceto the Tipulide. Proc. Linn. Soc. New South'Wales,52, 1927,in press).
I wish to expressmy deepest thanks to Dr. Dampf for thegreat privilege of examining this unequalled series of Mexican
Tipulida.

re27lAlexand,er: Crane-Fliesof Mexico

303

Limonia Meigen.
Limonia infucata sp. n.
General coloration orange, the praescutum with the narrow interlpac-es conspicuously dark brown; front silvery; antenne brownish
black throughout; halteres elongate, black; wingi dark brown, sc very
long, S9z
_at.the tip of_Sc1;male hypopygium with the ventral dististyl-e
an oval fleshy lobe, the rostral prolongation without the usual spines.
Male. Length about 5 mm.; wing, 7.3 mm.
Rostrum and-palpi dark brown. Antenne brownish black throughout; basal flagellar segments subglobular, becoming more elongate
outwardly, the outer segmentselongate-cylindrical. Fiont and antJriorvertex.silvery.the pos-teriorvertex nrfous; vertex narrow, the silvery
coloration ending at the narrowest point.
Pronotum light brown, vaguely variegated with darker. Mesonotum high and gibbous. Praescutum bright orange-rufous,the interspaces _appearingas -narrow dark brown lines, extending from thehumeral region, crossing the suture, and then appearing is narrower
margins on the mesal and caudal margins of the-icutal lobes; scutum
and scutellum orange-rufous, the median area of the former a little
paler, the caudal portions of the latter more infuscated; postnotal
pg{io.tergite obscureorange,darker laterally. Pleura testaceousyellow,
indistinctly variegated by a narrow brown stripe passing from thefore coxa above the halteres, on the pleuroteigitti becolming"ofmoreextensive. Halteres elongate, black, only the eitreme basethestem brightened. Legs with the coxe yellow, the trochanters more
obscure;remainder of legs brownish blaCk, the femoral basesscarcely
brightele_4;tarsi a.trifle_palerthan the tibia but not evidently brighd9"99. Yi"g.. relatively long, narrowedbasally, dark brown, the sti[maindicated_gnlyby a narrow seam at the end of vein R2; veins daiker
brown. Venation: sc very long, scr ending just before the fork of Rs,
Sczat its.tip; Rs long, subangulateat origin; basalsectionof Rsrelatively
short; distal sectionof Rr longerl R2+gabout two-thirds R3; cell -lsl Mz
shortly before the fork of M, subequalto the:1rort--rectangula^r;_nbcu
distal section of. cq; cell ?nd A relatively narrow, vein gia ,q being
gently sinuous.
Abdominal tergites dark brown, the sternites obscure brownish
yellow; hypopygium and gpgpenl eight somewhatpaler. Male hypoPygiury with the ventral dististyle appearingas a relatively smail bval
ngghy 19bj, the rostra-lprololgation cbnspicuous,nearly glbbrous,provided with a few sete but without the usual spines;befoie apex on outermargin with a small pale triangular flange.
Holotype, d, east of San Cristobal, swept from bushes indense forest of oaks and pines, altitude 22b0 meters, luly z,
L926 (A. M. Dampf); IvI. B. 186.

304

Annals EntomologicalSocietyof America [Vol' XX'

Limonia perflaveolasP.n.
-t. mm'; wilg' 4'5 T*'
MaIe. Lengthabout 3.5
it1aro4(4F.), of .which it may perhaps
ftry cloself .tfi.a-i.
pro,r"
only a "iri.l', diff.ting eipeciailyin the.shortersubcosta. pale'^"A;;;;;
p"r. 6to*tt. Iiemainderof bodv.entirelv
fld;iifi
fittte *ot" reddishyellow. Wings with theyellow, the mesS;;;;;
Sqt ending
stigmal spot ova-{3tJit"St t"t, ptt"; Sc rehlively short,the length ofbeforemidlengthof Rs, in mosttases at near one-thirdon
the distal
macrotrichie
this vein; ir, *ori- rp.fi-""t " i";"s ofthird of vein 2nd,A.
(A' M'
Holotype, &, Cerro San Cristobal, June 29' 1926
Dampf); M. F. 1005.
Paratopoty\e, f, June 30, 1926; M' F' 1007;paratype' &'San Cristobal,June 4, t926; M' F' 940'
Limonia ludibundasP.n.
brown stripes;
Thoracicpraescutumreddishyellow with-three dark
iongitudinal-line;pleura.dark with ahead black *ith";;iwto:;;"with a heavy brown;;1" f""git"ai""f rtrip.;'*i"St bro#nish.yellow
origin of Rs'
thejusi
i"f"ti""f'-rliott, End.ing b-eyond;;;;.;,-S,'---ntiit.
Lengtha6out6 mm';wing, 7'3.T*.'
etti"-ttt* black throlghout, the basal
Rostrum ""'d;;;it["k.
with short pedicelq the :11::,::qt""rt
flagellar ..g-"r,ir?irt-oval,
anterror vertex
6.3o*i"g frot"-L1o"gate-ovai.. Front and the narrowti" cototationexiendedcaudadonto the posterior
il;;ii;""ry--*rrii
1i"" t" the occiput, the remainderof theverrex ", " ,r-itlr;;;posteriorvertexand occiputblack'
MesonotalPraescutumreddish
pronotum ;"iil]"j"l[-r"t"t"rrv.
broadyellow with t*ee djrt brown rtrip"., the humeral region andlateralthebrown,
dark
tt" s.i"tite yellovr; scutumi"#;i ;;;H;;imediartarea,the scutellum
marginsof the bG;;;owly'y;-il#,-thewith gray. Pleura dark
and the post.,ot-omti"ct, #+;;1t hustedthe
ventral sternopleurite'
brown dorsatly]t"Jti.l"af' pai;; b;"wn on s_finethat extendsfrom
i;"1;gitudinal
the two "r,.tori'g";;;;;e-biown. the surfl-ce sparselypruinose'to tfre mero?,-f.".Us^itr"coxa
behind the fore
Legs with the coxe and trodart<
Halteres pale,basesmore yellowish'
chanterstro*rririi ;;11;; f"-oi"-nrgwnr ilt"ttbrown, the tips and thethe tips p"r.iot"i;i" a;tli. Uto*"; tibie darka-membranewith
tarsi black. Wings relatively't.i"g-t"d.. narrow;originthebeyondV?ft"wb.eforeandbrownishy"tto*'r,ii"ri"l,'-"f.lt.t
a ""it--rt, ?"q lhi-,{o""d-color of the cellsof Rs, in the ;";;-;;aof Rs and end of vein
bevond.tfr" coiJ; tiig-", a.lar-ge9Po.tul origin conspicuous
marginal;;i;"d ";f ;;;"; e'd of-ceil'/'l Mzr6,n!, veins dark brown;Hl;#spots at end's ";i;-t M-" Mn' Cu' and'.theAnalsuffusedwith paler
cells Ri' and,R3 conspicuouslv
efifi;;;rir".-Lf
l+,1tt" "i""--colored areas,darker wherebrown; veins t;;;';"1;;V"""tio": Sc relatively short, Sc1ending$;i;.
traversingthe il;;re27lAlerander: Crane-Flies of Mexico

305

at about lpposite one-fourth to one-fifth the length of Rs, Scznot far
from-its tip and likewise beyogd the origin.of l?i; l?s rehtiveiy short,angulated qnd ryeal5lv spured at-9dF"; inner end of cell Rs lying
proximad of cell lst-Mzrthe latter cell aSoutas long as vein M+zt"yo"Ei^t; m:cu lt .thq fork of M, subequalto the distai section of''Cir;" vein
Onil A relatively long and gently-sinuous.
Adominal tergites dark brownish black, the basal segmentsa little
variegated basolaterally with obscure yellow; sternites 51ack,the first
segment yellow; basal sternites narrowly llgea caudally with yeflow;.ventral distis_tvleo{ frygonygiqm pale.- Mile hypopygiu- *ittt th6ventro-mesal lobe of.the basistyle yery stout and deisiie,lerminating ina small apical. papilla. Ventral dististyle smaller than the basistj'le,deeplysplit apically into two parts, that bearingthe rostral proloneation,r.erybroqd, approximately equal in area to the remainder bf the"style;the actual beaklike portion is small, the usual two spinesfar removed
from the rostrum, lyrn$-on the face of the lobe near its end, surrounded
by a group of short delicate sete.
Holotype, d, Hueitepec, in dense leafy woods, altitude 2600
meters, June L4, L926 (A. M. Dampf); M. B. 170.
Limonia lud,ibund,a bears a superficial resemblance to
Dicranomyia osterhouti Alex. and D. translucida Alex. (panama),
but is a very distinct fly.
Dicranomyia Stephens.
Dicranomyia exata sp. n.
General coloration dark brown; front silvery; wings tinged withbrown, the stigma darker brown,. preceded and iolloded bf a paleiarea; Sc short,.Scz close to the tip of Scr; Rs angulated attd w6aHy
spurred at origin.
Male. Length about 4.b mm.; wing, 5.b mm.
Rostrum and palpl black. Antenna black throughout; flagellar
segments oval, more elongate outwardly. Head with the ironf andanterior vertex silvery-white; posterior vertex light gray with a blackisharea on either side.
Pronotum dark_brown, the scutellum obscure yellow. Mesonotal
praescutum shiny 4"t1. reddish brown with three dirker brown stripesthat are only a little darker than the ground-color, the humeral reg'ion
obscureyellow; remainder of mesonotumdark brown, sparselypruinose.
Pleura dark brown, the dorsal portion of the sternopleurite exiensively
pflel to prgdgce a short, broFd, longitudinal stripe. Halteres dar(the base of the stem narrowly obscure yellow. Legs with the forecox& $?tk, the other coxe more yellourish testaceius; trochanters
yellowish tgslacgous;femo_rayellow, the tips broadly infuscated; tibie
and tarsi dark broup,- Wings_with rathef strong brownish tinge, thestigma brown, esgeciallyneai the transverseveinJ; paler "t""*-6oioredareas before and beyond the stigma and in the anaj region; small andS06AnnaJsEntomologicalsoc'intyofAmerica[Vol.XX,
of Rg; veins !1own'
scarcelyevident brown Seamsat end of Sc and origin Macrotrichieoft? "uirt"lliii," ;;;ffi=b;ior" _ln" cordextensf.re.
'Scrandboth.'Scr
Venation: Sc short,veins relatively i;;i;6t.-at;;el;s G;tli*I"t#""tigi"

andweaklvspurred"t Ri; nt angulatedwith the basal
origin; distal ,""iiotr oJ-ft, short,'""ltty"in.alignment
section of Rz entirely
section of R2, , U.i"g "ery short'"tta tire distaT the other elements
atrophied; inner ""J?t *f & lytttg far proximad.of fork of M, longer
Ur t"Ut""t"""frttar; rn4u at the;i^;fi;;d;-."f1?tl'
than the distal sectionof Cuv,..,r--r--- L---^^-hypopygtum
pale1llittleaonlysternitesth;Abdomen artf.6io*",p.1". Male ]rVnonVSiumwith the ventrowith the ventr.i-Ai$.t'i.
"bty short and iessG, terminatlg il a weakmesallobe of th;" t;i;t'f"
lud'ibundasP.'.n:';;i;;1 i,rulr"t". v""lrii aistiityle much as in Limonia
1*g s"b;-qual portions,,the mesal one of which;""r"* ,pfi;6;;aff'-i"tosPlngslocited on the face of thisbears the rosti'il;i;"d;ti"ti-ah="the other more nearly straight'
mesal lobule, ""; "pi;; [ently'"o*"d,damp
Hototype, & , near summit of the Zontehuitz, in dense,(A. M. Dampf) ;virgin forest, altitude 2750meters, June 20, L926

M. B. L76.
Limonia
Dicranomyia exata is not greatly-different fromof the maleIud,ibunitosp. ,r., ..p..ially in the peculiar structure
examplehypopygium. Tht two speciesfurnish an interesting
Limonia andof the insufficient grounds on which the genera
Dicranomyia are rJ* being maintained as distinct.
GonomYia Meigen'
Gonomyia(Gonomyia)chiapasensissp' n'-rostrum obscure
Allied to G. (c.) aqualis A1ex.(Guatemala);yellow; pleura bluevellow; thoracic do"rortr,i"Ik glay, the scutellum" *fritL,ir^v"fro* i""[it,idi"at stripe; halt-ereselongate;wings
ilffitr:f-"i" ttypopyFitim*ittr the dististvle bifid'
with a strong .i;;#tt"g";point'
the---- longestarm-tetioitt"Titigin a simple-black
Aoit. Length about 5 mm'; wing, 6.mm'
Female. Length about 5-5'2 mm'; wlng' o mm'
palpi black
Rostrum oU.E"i" yellow, ; fitt1e daiker dorsally;
A"tert"* black througliout' ]Iead dalk gray' .
narPronotum gray, tfie anterior lateral pietergites sulphur-yellow,
Mesonotum
rowly intemrpi# bt ; d"tk spot before the wing--r9ot'.
darker brown;L;f s;;i, tire pralscutum ryittt three very -slightly
dar[black; scutumSraY' the medianstripes; pr"rraJrol;;l;;;;yellow, darker mediallyregion a little p"io; t"utellum "otttpi"oously.

ar base;postno"tiil"d;i!;;.;J;itii

regiont"y, it'i, "q1l:^l*eral whitish

conspicuous
narrowly V"ffo*irtr.---Ft6ot Ulue-grai ryitlt. " thefore coxa' on the
fr-om behindyellow longituiinJ-tt"in", "*t""ai"[ --ot.
yellowish and including the
Lecoming somewtt"tii"-pfli^ti%

Le27lAlexand,er: Crane-Fliesof Mexico

307

whole sclerite; pl_eurotergite gray;_ dorsopleural
membrane largely-thesulphur-yellow. Halteres elongbte, lrown,base of the stem p?t6.
!.s.r with the coxe dark grat, their lower faces brown; trochantersd?tf br-own, paler benea_lh;remainder of legs dark bro#n, the basesof the femora pale1. Wings -w]th a strong dusky tinge, ihe stigma
slightly darker, oval;veins -darkbrown. Venation:-Scrjrairrg opp&it.
or just beyond-theorigin of Rs, Sc2very variable in positiott,6-"ii*es
1t tle tip of Sd1,r11or€often removed from this tip, in extreme cases
Scralonebeing only a_litt1eshortert_hannt-cu;petioleof cell R3elongate,
subequalto or orrly a little shorterthan lRa;celilst Mzelongatl-recrangular, gently -widened_
outwar4ly; m-cu a little less than itJ own lengih
beyg1d the fork of.M; anterior arculus lacking.
Abdominal tergites_dark brown, the steinites and hypopygium
obscureyellow. . q"F hypopygiuln generallysimilar to G. (G)-diuah,sAlex.; outer fleshy-lobe_of the basistylerelatively
slender,dark-coiored,-conspicuous;
the -small, tria-ngular lobe at base-relatively
dististyl6bifid, one arrn forming a dusky rounded knob-that terminatesin abouta dozen setreof ya{9us- sizes,the other arrn narrowed outwardly, thelip.q:i-plg slenderblack point with the tip obtuse. rn equalis this tip
is bifid. Aedeagusand gonapophysesmuch as in oquitit, the subterminal spine of the former long and slender.
Holotype, &, San Cristobal, altitude 2L00 meters, June 4,
L926 (A. M. Dampf); M. F. 940.
Allotype, g , near San Cristobal, July LZ, Lg26; M. B. 1g0a.
Paratypes, 5 & &, with the allotype.
Gonomyia (Lipophleps)maya sp. n.
,Belongs-to the n g.ncqgroup; head and rostnrm orange; antenne
entirely .d?tkj thoracic pleura with a faint silvery longitudinal stripe;yi"gr with. the stigma barely indicated; male hypopygium-slngle with ihd
dististyle simple, fleshy, unarmed, terminating in a
powerful
fasciculateseta.
Male. Length about 3.3 mm.; wing, 8.7 mm.
Rostrum orangerthe palpi black. Antenne dark brown throughout;"Headflagellar -verticils elongate,-asin the males of this subgenus.
orange,the vertex behind infuscated.
?ronotum yellowish,.darker medially; anterior lateral pretergites
and anterolateral margins of the praescutum bright sulphur-yel-iow.
Mesonotal praescutum light brown, iparsely dustedwith gray;'broadly
medianarea of scutum--broadly obscure yellow;- scutellum brown,
margined_caudally. with yellowish; postnotum chiefly pal6 reddisirbrown. Pleura reddish brown, with a broad silvery tongitudinal area
beginning behind _the lore coxa, passing beneath the hilteres; dorsopleural legign dark. Halteres brownish-testaceous,the knobs obscurebrownish yellow. Legs with the cox& and trochanters reddish testaceous; femola gbscure brownish yellow, passing into dark brown on theouter half; tibie and basitarsi light brown, the tips darker brown;

30g

SocietyoJAmerica [vol. XX,
Annals Entomologicalremaind.erof tarsi dark brown. Wings relatively bro9d, witlr a rather

very
v:111Y,;;;;il- b;*"ittt-ii"ie, .t-hecostalreeion-clearer:!1ry:^
lhe dark ground-color; veinsP4eoale browrr, ,."r."-l-y%vident againstoforiginthebeforedistance
short
ettdittg?
{s'#;;:"'il;"ti;;;'sr,
the
to
close
fn'cu
closed;Mz/slcel1,n'cu;
thanft" ai.t"nce shorter-fork of.M.
Abd;inal tergites light brown, the sternites yellow; mgle q,rPop-V-(9r 8.), lhq
iirpdsiuq puch as in G. \!-.) rnanca.
si"*-;"il"*i.t.
,h.t
fl9sh1small
gi:lt:tlJ-g"a
B;;"tit long and-"i""'ir"i, with _single
seta; besidesthis, thein"a single very powerful faiciculate
i*-iti"t"sbristies^of medium size and three smaller ones on
thre-eei;|il/;bears
itt. -"r"1 face. Gott"pophysesasymmetrical,entirely pale, the,longest-spinoushaliot niot" a broad'flattened piate that narrows abruptly;ilfiCbasali"it:ut . porlion, this latter harrowed gradually to thei"l; rtf* smaller'apophysisis a stout, flattened,.sickle;;;.pililtipl
long asAi,a."gur long and^sl-ender,;h;p;d'bira".
-approximately as
tip.
acute
ttt"-U".irtyles, t rrro"rld very-gradually to theHolotype, d, San Isabel, altitude about 650 meters, July 30,
1926 (A. M. bampf) ; M. F. 1057. See additional ecologicalnotes at beginning of this rePort'
ParatopotYPe,'d.
Teucholabis Osten Sacken.
TeucholabisdamPfi sP. n.
General coloiation shiny coal-black; pronotum obscure yellow;
pleuralkrrousof the halteres otatrg"; two silvery aieas-on the thoracic;;;fiuht;ii;L;. ;i6;ldark .b.'ory";a nanow pale
subcirculal,_black.
brown seam on the a"nteriorcord; abdomen
Z.Tq'
5'8
wing,
mm.;
Male. Length, 5-O
flagellar
Rostrum "tiJ b"rpt- blaci. Antenne black throughout;segmentsshort-oval. Head shiny black' ..
Pronotum oU.""r"- y"llow, dtt" scutellum and .pretergites black'the scutellum a trifle Pa19t Pleura
tvt.r-orrott- rhi;y ;aiblact,$rith a denseut".t , *ith t*o consplcuouspaler areas that are coveredof theportioniif""ry p-"U"r."rr"", one area on the dorsal;il;U"pt"dark'.t"L"pf"-"titg tfrt oth"t on the meron; d'orso-pleuralmembrane forethewithorange.
Halteres a"iii, the knobs conspicuous]V
.Ifgt
obscurecoxe obscureV"ff"*lin" anterior fice darliened;iemaining coxeyellow,.thevellow : trochrJltt i'Jli*, ttte tips darkened; femoraob99ur9

thedistaltwo-thirds
iril. uria'r..".a1-t-Ja"rtohthefbrefemorawhere
andhind femoralfore;il;;; I i*irid"d, muchnarroweron the middle-iaeG ""Jtri"a tibie brownishY!!ow, the tipsnqrroylv
tibilt6k,
stigma subcircular,

subhyaline;"thei"r.i-Uto*"isttUtact . Wings;I";t"";a;anterior cord and a similar
dark brown; a-ialer brown seam onti""t-"-tidl9"gth of cells.M,9u and /sl -d,'veins black',r.g".-*.rtt.t
ttto"*, Scr endins. aboul .opposite one-third to. Venation: ,Sct;i;i;yremovedtwo-fifths the rlfiift .it nr, Sr, "bti.Ule"in position, in casesre27lAlexander: Crane-Fliesof Mexico309

fTqp the tip of Sc1,in others-closer
to this tip; R2.qarshortto virtuallyolliterated; basil sectionof ltz oblique in- position,about equal tb
R+zi cell /sl M2 elongate;rn-cucloseto the fork of M; vein-?nil,Anearlystraight. fn somecases,Sczis atrophied.
Abdomenblack,includingthe hypopygium;in somespecimens
thebasesof the sternitesnarrowlypalei.Holotype, d, summit of one of the mountains of the Moshbiquil range, altitude 2500 meters, in pine forest, July LZ, Lg26
(A. [,I. Dampf); M. F. 1033.
Paratopotypes,L5 d &.
The types were,fcund swarming about five feet above theground.
Teucholobisdampf. is named in honor of the collector, Dr.
Dampf, who has added so vastly to our knowledgeof the insectsof Mexico. It is readily distinguishedby the diagnosticfeatures
as given above. By meansof the writer's key to the American
speciesof the genus (Trans. Amer. Ent. Soc., 40:2BE-2BS;
1914),the speciesruns out at couplet 14.
Erioptera Meigen.
Erioptera(Empeda).stygra
sp.n.
Sizevery small(wing,d, 3 mm. or less);generalcolorationbrownish
black; wings strongly suffused with blackish; Sc short, veins Rs and Rr
divergent.
Male. Length about 2-2.4 mm.; wing,2.5-3 mm.
Rostrum and palpi dark brou'n. Antennre brownish black throughout. Head dark brown.
Thorax entirely brownish black. Halteres brownish black, thebasal third of the stem paler. Legs with the coxe and trochantersbrown; remainder of legs dark brown. Wings strongly suffused withblackish, the stigma scarcely darker; veins dark brown. Venation: Scvery short, Scr ending just beyond the origin of Rs, ,Sc2somewhat
removed from its tip, exactly opposite this origini Rz+s+ra trifle longer
than the basal section of R2; R3..,.astraight, longer than Rsi R{ and Rr
strongly divergent, R3 being oblique in position, cell Rs at margin
being more than twice as wide as cell R2; petiole of cell Ms shorter than,n-cu.,the latter at the fork of. M.
Abdomen brownish black, the hypopygium a trifle paler.

Holotype, d, San Isabel, altitude about 650 meters,July 30,
1926 (A. M. Dampf) ; M. F. 1057. Additional ecologicalnotes
given at the beginning of this report.
ParatopotyPe,&.
E. (E.) stygia is one of the smallest species of. Empeda so
far described.

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Erioptera (Empeda) oresitropha sp. n.
General coloration dark gray; wings cream-colored,the base andcostal region brighter; stigma conspicuous,dark brownl paler brown
clouds on the cord and along vein Cu in cell M; wing-apex a little
suffusedwith dusky.
Male. Length about 4 mm.; wing, 5 mm.
Rostrum and palpi black. Antenne black throughout. Headbrownish gray.
Pronotum dark Erayt yellowish laterally. Mesonotal praescutum
dark gr:aytwithout stripes; antero-lateralpretergitesnarrowly,sulphuryellow; humeral triangles paler than the grognd-colorl_pseudosutural
iovere black. Pleura dark Eray, the region of the wing-base ochreous.
Halteres obscure yellow, the knobs dark brown. Legs with the coxe
and trochanters brown; femora brownish black; tibie brown, the tips
darker; tarsi brownish black. Wings cream-colored,cells C
narrowly-andthe wing-basemore yellowish; stigma oval, dark brown;
and Scdistinct paler brown cloudsalong the cord and vein Cu, the latter almost
covering the distal half of cell M; u'ing-apex more or less suffusedwith
dusky; veins pale, much darker in the clouded areas. Venation: Sc
long,-Scr ending about oppositethree-fifths the length of the long Rs,
Sc2faint, far from the tip of Sc1,the latter alone about equal to r-rn;
veins Rg and Ra generally
basal deflection of Rz shorter than Rz+s+si
parallel to one another, cell Rz at margin being only a little narrower
than cell .R3;petiole of cell Ma about equal to m-cu, the latter at thefork of.M.
Abdomen brownish black, including the hypopygium. Male hypopygium with the apexof the basistylea little produced. Outer dististyl.e
idrongly bifid, the outer arm shorter, its apex expan-ded. Inner dististyle gently curved, a little expanded outwardly, the surface with afew scatteredsetule.
Holotype, d, Summit of the Zontehuitz, north of San Cristobal, altitude 2800 meters, swept from low bushes, Baccharisand Gaultheria, June 20, 1926 (A. -M. Dampf) ; M. B. L74.
E. (8.) oresitropha is generally similar to the larget E. (E.)
alticola Alex., differing conspicuously in the wing-pattern, thelonger and more evident macrotrichire of the wing-veins andthe details of venation.
Erioptera (Erioptera) quadricincta sp. n.
Allied to E. (.E.) annulipes Will.; tibire with four dark and four
white annuli, the first dark ring narrowest and basal in position; vein?nil A sinuous,the apex simple.

Male. Length, 2.8-3 mm.; wing, 2.8-3 mm.
Female. Length about 3.3 mm.; wing, 3-3.1 mm.
Rostrum and palpi brownish black. Antennal scape__brownish
black, the flagellum p-aler, especially the basal segments. Head clear
light gray.

rs27lAlexander: Crane-Fliesof Mexico

311- . Mesonotal praescutum pale grayish brown to yellowish brown,brighter brown laterally, the interspacesnarrowly darker and provided
with a row of conspicuousdark sete; posterior scleritespale.- Pleura
pa_lqbroryn with a narrow silvery longitudinal stripe extending frombehind the fore coxre, passing beneath the root of the halteres.
Halteres pale, the stem before the knob a little darkened. Legs withthe coxe and trochanterstestaceous;femora testaceousyellow at base,the remainderwhite with four brown to brownish black-rings,the firstpaler ?nd.sometimes more poorly.indicated, the remainlng annuli
it-rcreasingin size outwardly, the white inter-rings narrow, the extreme
tip white; tibie white with four brownish black rings, the first narrowest, at the base of the segment,the others alternating with narrower
white rings, on the posterior tibire the light and dark annuli subequal
in.area,_theapical ring white; basitarsi with the basal third and apicalthird. black, the central third white; second tarsal segment white;remainder of the tarsi black, forming the third dark taisal ring; thefemora thus appear to have four dark rings, of which the first miy be
more or less indistinct, the tibie four rings, the first narrow and basal
in position, the tarsi with three dark rings, of which two are on thebasitarsi. Wings grayish yellow, with marginal dark spots at the endsof the veins, alternating with white spots in the endsbf the cells, thewhite areasmore extensivethan the dark; veins yellow, darker in theinfuscatedareas;Sczand the cord brownish black. Venation: m-cu inalignment with r-rn, somedistance beyond the fork of.M; vein ?nd A,sinuouSrthe tip simple.
Abdomen pale brown, the hypopygium yellow.
Habitat: Mexico, Guatemala.
Holotype, cy',San Isabel, Chiapas, altitude about 650 meters,
July 30, L926 (A. M. Dampf) ; M. F. 1057.
Allotype, I , Tonala, Mry 23, L926; M. F. 930a.
Paratopotypes, several & g i paratypes, g, with the allotype;& 9, Santa Lucia, Chiapas, altitude 575 meters, J.tly 29, Lg26;
M. F. 1055; & g, Rancho Sabino Perez, altitude nearly 500
meters, July 28, 1926; M. F. 1052; d, Aguna, Guatemala,altitude 2000 feet, (Dr. G. Eisen).
Erioptera (Erioptera) dampfi sp. n.
General coloration ochreous; wings pale yellowish subhyaline, theveins pale; male hypopygium with the outer dististyle deeply bifid,
the arms slender;gonapophysesappearingas long slenderrods.
Male. Length about 4-4.2 mm.; wing, 5-5.2 mm.
Female. Length about 4.5 mm.; wing, 5.8-6 mm.
Rostrum ochreous;palpi dark brown. Antenne brownish black, insome casesthe terminal segmentsof the flagellum a little paler. Headochreous.
Thorax pale ochreousyellow, in caseswith a faint brownish tinge,
the lateral pretergites and lateral margins of the sclerite whitish yellow;

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Annals EntomologicalSocietyof America [Vol. XX,

pseudosutural fovee pale. Pleura brownish testaceous,_the sternopleurite and ventral pleurotergite paler, more yellowish to form a vague
longitudinal stripe. Halteres pale, the knobs a little darker. L.gt
with the cox€ and trochanters obscure yellow, the fore coxe darker;
remainder of legs yellow, the terminal tarsal segments darker. Wings
pale yellowish iubhyaline, the veins and trichire only a little darker.
Venaiioni Rz+a+nabout twice the basal section of R6; cell Mz open;
vein ?nd. r4 relatively short, ending before midlength of Rs, only the
distal fourth or less sinuous.
Abdomen dark brown, the hypopygium a little paler. Male hypopygium with the outer dististyle deeply bifid, the arms slender, the inner
irm about one-half longer than the outer, forming a gently curved
black spine. Inner dististyle broader at base, near midlength narrowed
into a gently curved sinuous spine. Gonapophyses appearing as long,
slender, nearly straight pale rods, lying generally parallel to one another.

Holotype, &, ttear summit of the Zontehuitz, in dense,damp
virgin forest, in immense numbers between the leaves of aBromelia association, altitude 2750 meters, June 20, 1926.
(A. M. Dampf); M. B. 176.
Allotopotyfe, 9.
P a r a t o p o t y p e s , Sd09 .
This very interesting Erioptera is dedicatedto the collector,
Dr. Alfons Dampf, to whom I am vastly indebted for manyfavors.
saturatasp. n.
Erioptera(Mesocyphona)Male. Length about 3 mm.; wing, 3.8-3.9mm.
Female. Length about 3.8 mm.; wing, 4.8 mm.
Generally similar to E. (M.) eiseniAlex., differing especiallyin thedarker coloration of the body, the dark wings with the white spotted
pattern more contrasted, the conspicuousblack subterminal ring of thefemur, and especially the structure of the male hypopygium.
Mesonotal praescutumwith the stripes more grayish than yellowish,
the interspacei and lateral margins black. Legs with the femora
yellow, with a broad black subterminal ring, about one-half wider thanlhe paie apex, the yellow coloration before and beyond this.ring somewhal palei than th-eremainder of the femur; fore femora with a muchnarrower additional black premedian ring; tips of the tibire narrowly
and weakly infuscated but scarcely blackened; basitarsus yellow, th9
tip and remainder of the tarsi dark brown. Wings witll the groundcolor much darker than in eiseni;costalmargin moreyellowish,especiallybasally; the white pattern arranged as in eiseni but appearing more
contrasted against this darker background; spots at ends of veins
Rr+zand R3widely separated.
Male hypopygium with the outer dististyle strongly bifid, as in
the subgenus,but the inner arm stout and weakly split at apex into

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313

two short divergent points; inner dististyle broad at base, the distal
half markedly narrowed and strongly sickle-shaped. Gonapophyses
flattened, relatively broad, the tips obliquely truncated.
Holotype, d, near San Cristobal, in shaded ravine ofmountain brook, altitude nearly 2200 meters, J.tly L7, L926.
(A. M. Dampf); M. B. 190 a.
Allotopotyfle, 9.
Paratopotypes, 2 d &.
Erioptera (Mesocyphona) apicinigra sp. n.
Male. Length about 2.8 mm.; wing, 3.6 mm.
Generally similar to E. (M.) eisenrlAlex., differing especiallyin the
broad blackened apices of the femora and the structure of the malehypopygium.
Mesonotalpraescutumwith the stripesmore grayish than yellowish,
the interspacesblack, the lateral margins narrower and paler. Legs
with the femoral tips broadly blackened,on the posteriorlegs including
more than the distal fifth; posterior femora with a still broader median
black rirg, the two enclosing a natrow subterminal yellow annulus;
tips of the tibie infuscatedbut not blackened;basaltwo tarsal segments
yellow, their tips and the remainderof the tarsi infuscated. Fore legs
broken. Wings with the costal half much darker than the posteriorhalf, the spots large and contrasted; costal margin almost uniformly
dark; no white spotsin the anal cellsexceptthoseat the endsof the veins.
Male hypopygium as in eiseni,the arms of the outer dististyle andthe inner dististyle all very slender and heavily blackened, the tips
acute and simple, very gently curved; inner dististyle without scatteredsete, as in eisen'i,. Gonapophyseslong and slender, the two taken
together appearing lyriform, the extreme tips very weakly expanded,
pale, obtuse.
Holotype, &, near San Cristobal, in shaded ravine of mountain brook, altitude nearly 2200 meters, July 17, L926 (A. M.
Dampf); M. B. 190 a.
Erioptera (Mesocyphona)leucopastasp. n.
Male. Length about 2.5 mm.; wing, 2.9 mm.
Fernale. Length about 3 mm.; wing, 3.2 mm.
Somewhat resembling in its general appearance,a small specrmen
of. E. (M.) eiseni Alex., differing in the wing and leg coloration and,especially, in the structure of the male hypopygium.
Praescutal stripes broad, restricting the dark brown interspaces.
Legs with the femora yellow, with a conspicuous.brownish black ringclose to the tip, the apex beyond it scarcely one-fourth the length of
this ring, white; a similar narrow whitish ring precedesthe dark annulus;
no premedial dark ring on fore femur; tip of tibire narrowly but conspicuously dark brownl tarsi pale yellow, the terminal two segments

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and the tips of the others brown. Wings with a conspicuousdark
brownish ground coloration that is only slightly paler in the posteriorcells; wing-spotsnurnerousand smail; a seriesof about six such spots
along the costa in the space beyond h and including the end of vein
Rr+zi the other marginal white spots are likewise small; the marks
along the cord and the other white areasof the disk similarly restricted;
veins dark, white in the pale areas.
Male hypopygium of very distinct structure. Outer dististyleprofoundly bifid, the basal portion including only about one-fourth thetotal maximum length of the style; outer arrn a straight slendersmoothspine; inner arm longer, the basal half or a little more stouter, theouter margin with a seriesof five or six irregular teeth, the long apex
a straight acute spine. Inner dististyle a flattened pale blade, at thewidest point about one-fourth the length, the base very narrowly
constricted, the outer margin densely fringed with long yellow sete.
Gonapophysesdark, the tips blackened, at about two-thirds theirlength strongly curved mesadtoward one another, their tips subacute.
Holotype, d, San Isabel, altitude about 650 meters, July
30, 1926 (A. M. Dampf) ; M. F. 1057.
Allotoptype, 9.
Paratopotyfe, g.
Erioptera (Mesocyphona)modica sp. n.
Male. Length about 1.8 mm.; wing, 2.3 mm.
Female. Length about 2.2 mm.; wing, 2.7-2.8 mm.
Very similar to E. (M.) inaariegataAlex. (AmazonianPeru) in theunmarked wings and uniforrnly darkenedlegs,differing in certain minor
details, as the uniformly pale halteres. The discoveryof the male sex
of inaariegatawill surely furnish genitalic di-fferences.
Antennal flagellumpaler than the scape. Scutellumpale testaceous.
Halteresuniformly pale yellow. Male hypopygium with the dististyles
long and conspicuous,the outer style a long straight rod, at about twothirds the length angularly bent and narrowed to a long acute apicalspine. Inner dististyle about as long, firmly fused with the outer styleor arrn, the tip expanded, bifid, the large outer arm truncated, its
surfacemicroscopicallyroughened,the slendersubapical arrn appearing
as a pale straight rod. Gonapophysesappearingas elongatedecussate
rods, black, narrowed gradually to the acute tips.
Holotype, d,Santa Lucia, altitude 575 meters, July 29,

1926 (A. M. Dampf); M. F. 1055.
Allotopotyfle, g.
Paratopotypes,d I ; paratypes, d g, San Isabel, July 30,
1926; M. F. L057'; d, between Santa Lucia and San Isabel,
July 30, L926; M. F. 1056; g , Rancho Sabino Perez, altitude
nearly 500 meters, in hilly country, Jnly 28, Lg26; M. F. 1052.

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315

Rhabdomastix Skuse.
Rhabdomastix (Rhabdomastix) isabella sp. n.
Antenne (d) approximately four times as long as the body; mesonotum brown, the pleura darker brown; wings brownish Bray, the stigma
darker; Rs relatively short, Rg oblique in position, remote from the tipof R1a2.
Male. Length about 5 mm.;wing, 5.2 mm.lantenna about 21 mm.
Rostrum obscureyellow, the palpi brown. Antenne (f ) elongate,
about four times as long as the entire body; scapal segments darkbrown, the flagellum yellow, the outer segmentsdarker; first flagellar
segmentabout one-third longer than the second,the succeedingsegments
becoming more elongated and attenuated, the extreme tips of theindividual segmentsdark. Head brown.
Pronotum and mesonotumuniformly rather dark brown, the surface
subnitidous; scutellum yellowish testaceous;postnotum'dark, paler
laterally and at base. Pleura dark brown, darker than the notuml
meron large. Halteres pale. Legs with the coxe brown; trochanters
elongate, brownish testaceous;remainder of the legs broken. Wings
with a brownish gray suffusion, the costal region somewhat darker;
stigma still darker brown; veins dark brown. Venation: Rs relatively
short, less than two times the petiole of cell Rai Ra short and oblique,at margin remotefrom Rr+2,the distanceon costa betweenthem about
trvice R3alone.
Abdomen yellowish brown, darker laterally; hypopygium lighter
brorvn.
Ifolotype, &, San Isabel, altitude about 650 meters, July
30, 1926 (A. M. Dampf) ; M. F. 1057. The additional data on
the conditions under which the above collections were made,at beginning of the present paper, should be consulted.
R. (R.) isabella is the most northern representative of thesubgenus so far discovered. It is most closely allied to R. (R.)
septentrionalis A1ex. (Costa Rica), differing in the still smallersize, the different thoracic coloration, and the distinct venationof the radial field.
Cryptolabis Osten Sacken.
Cryptolabis (Cryptolabis) luteiceps sp. n.
Head light ochre-yells\ar;thoracic dorsum dark brown; pleura dark,with a longitudinal yellow marking; tips of femoraand tibie infuscated;wings rvith Rs short and very strongly convex.
Male. Length about 2.7 mm.i wing, 3-3.1 mm.
Female. Length about 2.6-2.8mm.; wing, 3.2-3.6mm.
Rostrum obscure yellou'; palpi brown. Antenne with the scapal
segmentsbrown; flagellum pale brownish testaceous;flagellar segments
short-oval to subcylindrical, decreasingin size outwardly. Head lightochre-vellow.

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Pronotum obscureyellow; lateral pretergitesnarrowly cleareryellow.
Mesonotal praescutum testaceous with three confluent dark brown
stripes, the extreme lateral margin of the sclerite obscure yellow;
scutellum large, brownish testaceous;postnotum darker. Pleura dark,with an obscure yellow longitudinal mark on the sterno-pleurite.
Halteres obscure yellow, the knobs whitish. Legs with the coxe andtrochanters testaceous yellow; femora yellow, the tips infuscated;basitarsi obscure yellow, the tips and remainder of the tarsi brown.
Wings whitish subhyaline, the veins darker. Macrotrichia of the cells
sparie, present in all cells beyond the level of cell Rz. Venation: sc
relatively long, Scr ending opposite or beyond two-thirds the length ofthe very strongly convex Rs; basal sectionof Rzoblique to subtransverse,
about equal to l?2-,q;veins R3 and & with the tips deflected gently
toward the cephalicmargin of the wing; veins Mr+2,Ma and Mr similarly
deflectedtoward the caudal margin; cell Ms deep,its petiole very short;cell Mq relatively short and wide.
Abdomen brown, darker in the females,this presumablycausedby
the presenceof eggswithin; terminal segmentsmore yellowish.
Holotype, d, Tonala, attracted to light between 7 and
8 P. M., on the shores of a small clear rivulet flowing overpebbles and stones, May 23, 1926 (A. M. Dampf) ; M. F. 930a.
AllotopotyPe, 9.
Paratopotypes, 3 I 9.
C. (C.) luteiceps is readily told by the coloration of thehead.
Molophilus Curtis.
Molophilus obediens sp. n.
Belongs to the plagi,atusgroup; general coloration dark brown;mesonotal praescutum ochreous,with three brown stripes, the lateral
stripes occupying the margin of the sclerite between the pseudosutural
foveare and the transverse suture; male hypopygium with the basal
dististyle a powerful black spine with a smaller, curved lateral spine
shortly beyond the base.
Male. Length, 3.2-3.5 mm.; wing, 4.3-5 mm.
Rostrum and palpi brownishblack. Antenne short, black throughout. Head grayish brown.
Pronotum dark, obscure yellow behind, the anterior lateral pretergite yellow. Mesonotalpraescutumochreous,with three conspicuous
brown stripes, the broad median stripe darker in front, somewhat
paler behind, the lateral stripes obcupying the extreme lateral marginsof the sclerite behind the pseudosutural fovee; the interspaces andconcoloroushumeral regionare thus unusually wide;in somespecimens,
the dark stripes are broader, restricting the interspaces,which are thencut by the pseudosutural fovee; in still other specimens,only thehumeral region of the sclerite remains of the ground-color; scutum
pale,eachlobe with two darker spots,the medianregiona little suffused;rs27lAlexander: Crane-Fl,iesof Mexico

317

scutellum and postnotum dark brown. Pleura dark brown. Haltereswith the stem brown, the bases narrowly obscure yellow, the knobs
obscureyellow. Legs with the coxe and trochantersbrownish testaceous, the fore coxe darker; femora and tibire brownish yellow, with darksete; tarsi brown. Wings with a grayish suffusion,the stigmal region,
relatively conspicuous;macrotrichia dark. Venationi .R+r subequalto
twice as long as the basal sectionof R6; R213about one-halflonger thanm-cu; petiole of cell Msbetweentwo and three times nL-cu;vein ?nd A
relatively long, only gently sinuous,ending about opposite one-fourth
the length of the petiole of cell Ms.
Abdomen, including the hypopygium, dark brown. Male hypopygium with the basal dististyle broad and powerful at base, on outermargin shortly beyond the base with a curved thumblike spine, thelong axis beyond this point gently curved to the acute tip, the mesal
margin weakly roughened. Basistyle with the apical beak relatively
slender.
Holotype, & , near San Cristobal, in shaded ravine of mountain brook, altitude nearly 2200 meters, July L7, 1926 (A. M.
Dampf); M. B. 190a.
Paratopotypes, 5 d &; paratypes, & &, San Cristobal, June
4 , 1 9 2 6 ;M . F . 9 4 0 ; J u n e 1 5 , L 9 2 6 ; M . F . 9 7 3 .
Molophilus fuscopleuralis sp. n.
Belongsto the plagiatusgroup; thoracic notum reddish brown, thepostnotum and pleura dark brown; male hypopygium with the basal
dististyle a powerful chitinized rod, bearinga spinulosebranch on outerface beforemidlength, the main spinewith a long densebrush of black
sete along the mesalface.
tr[ale. Length about 4.2-4.3 mm.; wing, 5.5 mm.
Rostrum and palpi brownish black. Antenna brown, the second
scapal segmentdarker; flagellar segmentselongate-oval,covered witha denseerect white pubescence. Head dark blackish gray.
Mesonotal praescutum pale ochres to reddish brown, without
distinct darker stripes,the posteriorscleritessomewhatdarker; postnotum dark, sparselypruinose. Pleura entirely dark brown, contrastingwith the paler praescutum. Halteres obscureyellow, the stem beyond
the base darker. Legs with the coxe and trochanters dark brown;
remainder of the legs dark brown, with dark sete, the terminal tarsal
segmentspassing into brownish black. Wings with a strong yellow
tinge, the veins pale brown; macrotrichire dark brown. Venation:
Cells beyond the cord deep; petiole of cell I[sa little shorter than thebasal section of Mr+z and nearly three times rn-cu; vein ?nd A gently
sinuous,ending about oppositeone-fourth the length of the petiole ofcell Ms.
Abdomen, including the hypopygium, dark brown. Male hypopygium with the spine near apex of basistyle slender. Basal dististyle a powerful chitinized rod, before midlength on outer face with astrong lateral spine that is weakly spinulose;the main axis of the style318

Annals EntomologicalSocietyof America [Vol. XX,

is gently narrowed to the dcute tip, the mesal face from about opposite
the level of the lateral spine almost to the apex with a densebrush oflong black sete.
Holotype, d , near summit of the Zontehuitz, in dense, damp
virgin forest, altitude 2750 meters, June 20,1926 (A. M. Dampf) ;M. B. L76.
Pa.ratopoty/e, &.
Molophiluspennafussp. n.
Belongs to the plagiatus group; general coloration of the mesonotum
reddish brown, the pleura dark brown; antenne (tr) relatively long;male hypopygium with the basal dististyle an elongate simple rod, themesal face densely fringed with long setre and scattered black spines.
Male. Length about 4 mm.; wing, 4.8-5.2 mm.
Rostrum and palpi black. Antenne relatively long, in the male, if
bent backward, extending about to the base of the abdomen, brownish
black throughout; flagellar segments elongate-oval. Head dark.
Pronotum dark, the scutellum testaceous; lateral pretergites yellow.
Mesonotal praescutum pale, with three reddish brown stripes that are
confluent or virtuallv so, the humeral region and lateral margins yellowish; pseudosutural fovee not conspicuousagainst this nearly concolorous.
background; scutal lobes reddish brownl scutellum testaceous, darker
medially at base; postnotum reddish brown, the dorsal portion darker.
Pleura dark brown, the sterno-pleurite ventrally paler in color. Halteres.
pale, the knobs yellow. Legs with the coxa and trochanters yellowish
testaceous; remainder of legs brown, with dark sete, the tarsi passing
into brownish black. Wings with a strong grayish yellow tinge, thebase and costal region clearer yellow; veins darker yellow, with brownmacrotrichiee. Venationr Rz+slonger than the petiole of cell M3, thelatter about twice rn-cu; vein ?nd' A elongate, gently sinuous, ending
about opposite midlength of the petiole of. cell Ms.
Abdomen dark brown, the hypopygium conspicuously yellowish.
Male hypopygium large and conspicuous. Basal dististyle a very
elongate simple rod, the basal fifth straight, beyond this point gradually
narrowed and gently arcuate, the mesal face of the curved portion
being densely provided with abundant sete and subappressed stout
black spines; apex of the style a stout black spine.

Holotype, &, San Cristobal, altitude 2100 meters, at light,
June 8, 1926 (A. M. Dampf); M. F. 950.
Paratopotypes,
d &; June 8, 1926;M. F.952; d d,June 15,.
1926; M. F. 973.
M. pennatusis most closelyallied to M. orion A1ex. (Costa
Rica), from which it differs in the general coloration, structureof the antennae and the more elongate basal dististyle of the,male hypopygium.