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R e p r i n t e t lf r o n r T H E P A N . P A C I F I CE N T O M O L O G I S TJuly,1956

Vol. XXXII, No. 3-pp. 123-123

TWONEU/CRANE.FLIESFROMPOINTBARROW.
ALASKA(Tipulidae: Diptera)Cnlnres P. ArnxeNDER
Il ntuersity ol Massachu,setts,
Antherst

In the survey now in progress covering the Tipulidae of theYukon and Alaska, a number of important lots of specimensfrom
various sourceshave been received.At this time it seemsadvisable
to describe two forms from Point Barrow and vicinity, taken by
Dr. Paul D. Hurd and Dr. Neal A. Weber, to whom my thanks areextendedfor the privilege of naming the materials.
Prionocera gracilistyla Alexander, new species
Belongsto the serricorni.rgroup; nasus lacking or reducedto
a tubt'rc:le;male hypopygiurn with the dorsal tergal lobes relatively
srnall, with abundant short curved setae, lateral lobes slender,
nredianlobe low and convex; outer dististyle very broad acrossits
base. narrowed outwardly; inner style unusually slender,especially the rostral portion.
Male.--Length ahout ll-13 nrnr.: wing 13-15 mm.: antenna about 3.6.1 rirnr. I"arncle.-Length about l5-21 nrm.: wing 15-19 nrnr.
Nasus lacking or reduced to a small tubercle: frontal prolongation of
Itead unifornrly darkenetl: palpi black. Antennae black throughout,in malethe basal three flage!lar segnrentsstrongly serrate,the succeedingones less
er-idently-so: in ferrnale,flagellar segnrentsless distincdy serrate, pedicel
and ntost of the first llagellar segnrentconspicuonslyyellowed. Head above
dark gral'. with a consJticuous
dark rnedian stripe: vestiture long and pale.
Pronoturn dark brownish gruy. Nlest-rnotal
praescutum and scutum dark gray,the fourrer with three darker plumbeous stripes, the median one more orless rlistint:tl.v divided in front by a caJrillary darker line; scutellum andposttrtttunr
lighter gray, with a capillary dark nredianvitta; thoracic vestiturelong anrl conspicuous. Pleura gray: dorsopleural membrane bufiy brown.
Halteres with stem brownish yellow, knob dark brown. Legs with the coxae
and trochanters dark gray: femora brownish yellow, the tips narrowly darkbrown: tibiae brownish yellow, the tips more broadly blackened; tarsi black;claws of nrale srnall, toothed. Wings grayish subhyaline, cell Sc and stigma
yellowish brown, cell C somewhat paler: a more or less distinct darkened
cloud in llases of outer radial cell-" beyond the anterior cord; veins brown,
sc and veins near arculus paler. veins, with the exception of R, glabrous.
Venation: Cell M' usually short-petiolate to almost sessile, the longest
petiole about one-half m; in one female, the petiole is longer than m.
Abdominal tergites dark gray, with a broad continuous brown median stripe,ending on the seventh segment; lateral borders broadly, posterior margins
very narrowly. yellowed; sternites dark gray, the posterior borders very
narrowly yellow: dististyles of hypopygium fulvous. Male hypopygium withthe dorsal tergal lobes relatively small, as compared with parrii and serrj-

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cornis,a little dilated outwardly and extendedmesad,partly closing themediannotch; marginsof lobeswith abundantrelativelyshort curved setae:
lateral tergal lobes slender, median lohe low, conl'ex. Outer dististyle verybroad across base, narrowed outwar<lly,the apex olltuse. Inner dististyleunusuallyslender,especiallythe producedrostral portion, this with several
puncturesalong ventral part before the slightly
snrall blackenedsetigerr,rus
expandedapc:x.

ln parrii, the dorsal tergal lobes are very broad, the notchcorrespondinglynarrowed; apices of lobes obliquely truncated,with relativelysparsesmall setae;lateral tergal lobes low. Outerdististylenot conspicuouslywidened acrossbase,very gradually
narrowed to the broadly rounded tip. Inner dististyle with thebeak only moderatelyproduced,the dilated basalpart of style notunusuallynarrow.
Holotype, male, Potvr B.lnnow, Atrsra, June-August' 1950
(N. A. Weber), Collector'sNo. 26M; United States National
Museum.Allotopotype,female,July 27,1949 (Weber), No. 2514.
Paratopotypt's,B males and females,July 10-2;1. 1952 (P. DH u r d) .
Frotn the other Arctic speciesof the serricornis group thathave the median line of the praescutum darkened. including
Prionocera lackscheuitziMannheims,,P. parrii (Kirby), and P.
serricornis(Zetterstedt), the present fly differs evidently in thestructureof the male hypopygium, including the tergite and both
dististyles.Earlier (CanadianArctic Expedition 191:l-18, 3 C:
8c-9c; l9l9), I had identified materials from the Northwest
Territories of Canada as being pa,rrii, otherwise known fromMelville Island and Greenland.There has beenno opportunityto
and for the time being it seems
examinethe type of this spec:ies
best to ('onsiderthis earlier determinationas being corr,ect.Thereseemsto be no doubt of the distinctnessof thesetwo Arctic species
of.Prionocera in Alaska.
Pnulctl (Tntcvt'noNA)HANI{AI(Alexand,er)'l'rict.phonahunnui Alexander; North Anreriean Fauna. 46:160-161,(r'enation(fig.
), pl. 10. fig. 6 ( 6 hypnpygium) ; 1923.
I
pl. l0

The type, a male,was from St. GeorgeIsland,Pribilof Islands,Alaska,taken June 10, 1914,by G. DallasHanna.
Pedicia (Tricyphona) hannai antennata Alexander, new subsp.
Generallyas in the typical race,as cited above,but fully'winged
in tht: male sex, the wings greatly reduced in the female. Diffierences in the length and degree of slendernessof the legs aro

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correlated with the reduction of the wings. The male hypopygium
is virtually identical in both forms.
The antennaein the unique type of typical hannai were notclearly discernible. In the present fly, this organ is exceedinglyreduced, there being only five or six separatesegments;the basal
fusion-segmentis large and massive,with two or three unfused
segmentsbeyond, the last being the longest. Wing venation ofmale similarly variable, normally with R, longer than Rr*zi Rt
entirei Rr*, long-fused,subequalin length to cell Rn; cell Ist Mz
closed; cell M, present, from twice to three times its petiole. Incases,thetip of R, is atrophied and cell M2 is open by the atrophyof M. In still more abnormal specimens,still other veins aredeformed or atrophied at their tips. In the female, the wings are
reducedto short, strongly infuscatedstubs, about 2.5 to il times
as long as wide, the venationtotally distorted.
Holotype, male, Potnt Blnnow, Atrsne, June-August, 1950

(N. A. Weber), Collector'sNo. 264I; United StatesNational
Museum. Allotopotyry,female,July 27, 1949 (Weber), No. 2515.
Parato'potypes,
male and female, June-August, 1950 lWeber),Nos. 2640, 264I, 2644; IB males and females,July 7-23, L952
(P. D. Hurd) ; July 27-30, L949 (Weber),Nos. 2515,2528,2534.
Paratypes,I male,W'estAnaktuvuk Pass,68o, 20' N. Lat., 15Io,
30' W. Long., 1949 (Weber); I male, Umiat, Upper ColvilleRiver, Alaska, 68o N. Lat., 160' W. Long., 1950 (Weber),Collector'sNo. 2605.