No. 64J DIPTERA OF CONNECTICUT: TAXONOMY 463 



tributed over disk ; male hypopygium with two well-developed, long and 

 slender dististyles, the outer a little longer than the inner hubbelli 



8. Thorax and coxae reddish yellow luteola 



Thorax reddish brown to gray, in the former case the praescutum with a 



median brown vitta 9 



9. Mesonotal praescutum reddish, with a median brown line that is som-.^timos 



indistinct; antennae either pale throughout or with only the outeriuii>t 

 segments darkened; gonapophyses of hypopygium bifid near apex ..pygmaea 

 Mesonotal praescutum brownish gray; antennae dark brown to black. th( 

 basal four segments pale; gonapophyses of hypopygium slender, simple 



(Fig. 54, E) nigripila 



10. Wings with cell 1st Ah open bv atrophy of in. tlie cell thus opening into 



cell 2nd M; 1 1 



Wings with cell 1st M2 open by atrophy of basal section of vein \h.. the 



cell opening into cell M3 ' "' 



11 \'ein 2nd J sinuous, at tip bent stronglv toward 1st .1 , narrowing the cell 



holotricha 



Anal veins divergent {nigripila group) .■■■■/ ^" 



12. Antennae dark brown throughout; mesonotal praescutum yellowish brown, 



with three dark brown stripes ; scutellum brownish yellow ; wings strongly 

 tinged with brown, the veins conspicuous; cell Ms short, only a httlc 



longer than its petiole .••■•• . -Qaspensis 



Antennae with the basal four or five segments pale, the remamder brown, 

 mesonotal praescutum grayish brown, with, a median, darker brown vitta ; 

 scutellum gravish brown ; wings hyaline, the stigmal region slightly darker, 

 the veins inconspicuous; cell I/3 elongate, approximately twice its petiole 



palpaiis 



13. Antennae of both sexes relatively short, not exceeding the combined head 



and thorax (compare dentifera, fcrnahh) W i " \ 



Antennae ( $ ^ approximately as long as the entire body, or a little shorter 

 (mesocera)', extending at least to midlength of the abdomen; flagellar 

 segments more or less narrowed apically, giving a bead-like appearance ^^^ 

 to the organ ■ • •. •. : i' ' li' ' 



14. \'ein 2nd A arcuated, at its tip bent toward 1st A ; m a lew species only the 



extreme tip of 2nd A is so deflected ,,^ 



Anal veins gradually divergent .•■■;■■,■■; a'a '',\a 



15. Coloration of body gray; stigma conspicuously dark brown, preceded and 



followed by more whitish areas {mcigcnn group) .... -. :■• 



Coloration of body reddish or brown ; if gray {fcrnaldi). the st.gmal region ^^^ 

 is not conspicuously darkened • : ; ' ' ,, 



16. Male hypopygium with both pairs of gonapophyses conspicuously serrate on ^_ 



outer and apical margins (Fig. 53. D ; 54, I) ••••■•• : • • • ; • • ■ • ■••■.■■ ' : ' 

 Male hvpopygium with the gonapophyses only weakly if at all se rate, 111 

 the latter case only a single pair so toothed (Figs. 53,^ez, 1^,^54, ^^^^^ • j-^^^^jj 



17. Hvpopvgium with the outer dististyle bispinous (Fig. 53, D) ■ ■■■^^1° '"^ 

 Hypopygium with the outer dististyle bearing a single spme (Fig. M^^I) 



ridens 



18. Hypopygium with the gonapophyses notably unequal in length, the miter 



or longer pair not dilated at base (tig. M, i^} ■ • •.• ■ • • ■ • ■ • • ' ' , 



Hvpopvgium with the gonapophyses approximately equal in ^^-^^^■^'l^J 

 more unequal (ithacana), the longest pair strongly dilated at base (1... ^^^ 



19. Gwp!nLs'appeaHng'a;';eiativeiy';h;rrblackened spikes (Fig. 53. G^)^^^. 

 . Gonapophyses more elongate, the basal pair .^ysei^atel^ore tips .0^^ 



apoV.vs« s.rcgly dilated at bases pale except f<,r b ^t™ f .J^^d "n 



Slacke-ied tips: omer dististyle ustmlly bispi..o..s, *e sptnes n.r^.tu,^ 



acana 



nnnosite directions toward one another (Fig. 53, i) ••••••• v; "■■ '.^^.i, 



20. OnTasLgle dististyle is well-developed, the outer beng reduced to a .mall _^ 



or vcrv small, obtusely rounded lobule (hig. b6, ^- " ' • V," \\ 7 



Both dististyles well-developed, subequal m e-^gth F .g. 5^ H J) -^^^-^ ^^ 



21. General coloration gray; antennae {$) lelatuen lon^. 



