3f8240

BULLETIN,

PUBLIC MUSEUM, MILWAUKEE[Vol. 8APPENDIXA NEW SPECIES OF TIPULA F'ROIUWISCONSIN( Tipulidae; Diptera)
By CharlesP. Alexander"*lt,,tt"oi3lL5$;i;rr,-.
rr".,,"ttnn?f
General coloration gray; antennaebicolorous,dark brown, the basal
enlargementof the proximal flagellar segmentsobscure yellow; mesonotal praescutum with four narrow brown stripes; femora yellow, thetips narrowly blackened;wings with a faint brown tinge, the prearcularand costal regions a trifle darker; abdominal tergites gray, with threebrown longitudinal stripes that are interrupted by the pale caudal andlateral margins of the segments;rnale hypopygium with the tergite distinctly separatedfrom the sternite by a suture, its caudal margin produced into a flattened lobe that is deeply emarginateat apex.
IVIale.-Length, about I2-I3 mm.; wing, 12.5-13mn-l.;antennaabout
4.5-4.8mm.
Fernahe.-Length,about 13-13.5mm.; wing, ll-11.5 mm.
Frontal prolongation of head light yellowish brown, sparsely pruinose; nasus long and slender; palpi dark llrown, the terminal segmenta
trifle shorter than the combined secondand third segments. Antennae
with the scape,pedicel and first flagellar segment obscure yellow; succeeding flagellar segments black, the basal enlargement obscure lightyellow, this color becoming more suffused with darker on outer segment:s,the terminal ones uniformly blackened; thirteenth segment reduced to a tiny thimble-shapedbutton; antennae of female shorter.
Head gral, more brownish gray on the sides of the posterior vertex;
vague indications of a dark median vitta on vertex.
Mesonotal praescutum brownish gray, with four narrow brown,stripes, the intermediate pair distinct, each gradually narrowed behind,the lateral stripes les's distinct to subobsolete: posterior sclerites ofmesonotum light gray, the scutal lobes vaguelv marked with brownish;a faintly indicated capillary brown vitta on the scutellum and postnatal

reszlDICKTNSON, WTSCONSIN CRANE-FLTES

241

mediotergite. Pleura clear blue-gray, the dorso-pleural region more
buffy. Halteres dark brown, the base of stem obscure yellow. Legswith the coxae light gray; trochanterspale yellow; femora yellow, thetips narrowly but conspicuouslyblackened;tibiae obscureyellow, passing into brown on distal half or less; tarsi black. Wings with a faintbrown tinge, the prearcular and costal regions, with the stigma, darker
brown; a vague darker cloudingbetweenthe branchesof. Cu; obliterative areasbefore the stigrnaand acrossthe baseof cell 7st M,. Venation : R, * , entirely preservedbut without macrotrichia; cell M, deep,
its petiole subequalto ?n; nt-cu connectingwith t[r** at about midlength; cell Znd A wide.
Abdominal tergites gray, more brownish gray on basal two segments; a broad median and narrower sublateralstripes dark brown;caudal and lateral margins of tergites narrowly grayish buffy to yellowish; basal sternitesyellowish; subterminalsegmentsmore extensively
infuscated; hypopygium relatively small, obscureyellow. Male hypopygium with the tergal region separatedfrom the fused sternite-basistyleby " distinct suture. Tergite with the median region produced caudad
into a broad lobe that is deeply emarginateat apex by " Ll-shapedincision, the margins of the notch set with microscopicblackenedpoints.
Outer dististyle a broadly flattened yellow blade, slightly widened outwardly, its outer end subtruncate. Caudo-mesalportion of sternite,irnmediatelybehind the basistyle,producedmesadinto a small, unequallybilobed,hairy appendage. Eighth sternite unarmed, its posterior margin straight. Ovipositor with the valves long and heavily.sclerotized.
Habitat.-Wisconsin.
Holotype, Crawfish River, Columbia County, in tamarack bog, May28, l93L (W. E. Dickinson).
Allotopotype.
Paratopotypes,4.
Holotype and Allotype in the N{ilwaukeeMuseum.
I take great pleasurein naming this interestingnew speciesof Tiltula
n honor of the collector,ffiy f riend. Mr. W. E. Dickinson. The general appearanceof the present fly is rrruchlike that of T. sulphurea
Doaneand 7. kennicotliAlexancler,belongingto the oleracao(tricolor)group of the genus,in which the tergal and sternalelementsof the malehypopygium are fused intc a continuotr ring. Ti,pula dichinsoni be242

BULLETIN,

PUBLIC MUSEUM, MILWAUKEE[Vol. 8group, having nearlylongs to what has been called the sunbrnaculflta
immaculatewings and with the tergite of the male hypopygiumentirely
separatefrom the fused sterniteand basistyle. The speciesis quite distinct from any similar speciesin the local fauna by the colorationof theantennal flagellum, the position of tn-cu at near midlength of M, * n,and the structure of the male hypopygium. The peculiar antennalpattern, with the basesof the individual flagellar segrnentspaler than theouter portions, is found in only two of our local speciesof Tipula; T.
flaaibusisAlexander and f. tephrocephalaLoew.re321

251

DICKINSON, WISCONSIN CRANE-FLIESa.

b.

FIG. I97-Tipula
dic-hh^sonin:s_p. _a_. Dorsal view of hypopygium; b. Lateral view of hypopy.
grum; and wing. M.P.M. No. 78360, Holotype.