20S 



CONNECTICUT GEOL. AND NAT. HIST. SUR\rEY 



[Bull. 



Key to Siihtribes, Genera and Subgenera 



Legs unusually long and filiform; wings with vein i?i+E atrophied and with 

 Sci ending in Sc close to origin of Rs {Dol'ichopesa, Figs. 24, A, B) ; or 

 Ru2 preserved, Sc very long and Sci reaching C as a distinct element some 

 distance beyond fork of Rs; r-ni shortened or obliterated by fusion of 

 adjoining veins (Brachyprevina, Fig. 24, C) (Dolichopezaria) 



Legs of normal stoutness for the family; wings- (Fig. 24, D-H) with vein 

 Ri+2 preserved; when latter is atrophied (a few species of Tipv.la) , with 

 r-OT disinct, Sc of moderate length, Sci atrophied before fork of Rs and 

 with ,S"c2 ending at or near midlength of Rs (exception, some Longurio, 

 which never have white on legs, as is the case in Brachypremna) 



Figure 24. Tipulinae; venation. 



A. DoUchopeza (Dolichopesa) ameri- E. Prionocera fiiscipennis (Lw.) 



cana Ndm. _ F. Longurio testaceus Lw. 



B. D. (Oropeza) similis (Johns.) G. Nephrotoma ferruginea (Fabr.) 



C. Brachypremna dispellens (Wk.) H. Tip^da (Lunatipula) bicornis Forbes 



D. Ctenophora angustipennis Lw. 



Symbols: A, Anal; Cxi, Cubitus; M, Media; R, Radius; Sc, Subcosta. 



2. Wings with R,^. atrophied; Rs short, transverse, simulating a cross vein, 



about equal in length to one-half m-cu (Fig. 24, A, B) Dolichopeza 



Wings with i?i,, pale, perpendicular to R.2^3; Rs stronglv arcuated' at origin 

 (Fig. 24, C) Brachypremna 



3. Antenna! flagelluni of male branclied (Fig. 25, A, B), of female branched 



or serrate; flagellar verticils present but short; legs' relatively short and 



stouc ^ Ctenophoraria ) 4 



Antennal flagelluni simple (serrate in Prionocera; Fig." 25, C), which is 



readily told by lack of antennal verticils) ; leg;; usually more slender 



(Tipular;a) S 



