No. 64] DIPTERA OF CONNECTICUT: TAXONOMY 311 



Wings with cell 1st M, closed ; thoracic pleura not striped : male hypopygium 

 having tergite without median sclerotized rod; dorsal dististyle lacking or 

 microscopic ' 3 



3. Male hypopygium with a single spine on rostral prolongation of dististyle, 



this placed at near midlength of the prolongation (Fig. 35, L) lacroixi 



Male hypopygium with two rostral spines, these placed at ahout one-third 

 the length of the prolongation (Fig. 36, L) walleyi 



4. Wings with cell 1st M2 open by atrophy of nt 5 



Wings with cell 1st M 2 closed 11 



5. Antennae with at least the basal segments pale ; body shiny or subnitidous 6 

 Antennae dark brown throughout ; body opaque 7 



6. Mesonotal praescutum with a dark median stripe ; no brown areas on ventral 



sternopleurite ; male hypopygium with the tergite deeply notched medially ; 

 spines of rostral prolongation of moderate length; gonapophyses with a 



lateral flange (Fig. 35, J) immodesta 



Mesonotal praescutum with three more or less distinct brown stripes ; ven- 

 tral sternopleurites infuscated ; male hypopygium with the tergite very 

 shallowly notched medially ; rostral spines very long ; gonapophyses with 

 mesal-apical lobe slender (Fig. 35, F) gladiator 



7. Wings with Sci ending about opposite origin of Rs, the latter fully twice 



the basal section of i^t+s; male hypopygium (Fig. 35, K) iowensis 



Wings with Scx ending some distance before origin of Rs, the latter subequal 

 to basal section of 7?h-d. (brevivena and allies) 8 



8. Mouth parts relatively long, approximately equal in length to remainder of 



head rostrifera 



Mouth parts shorter than head 9 



9. Rostrum obscure yellow; vein Sc, about one-half the length of m-cu; male 



hypopygium (Fig. 35, A) brevivena 



Rostrum dark brown ; vein Sci long, subequal to or only a little shorter than 

 ni-cu 10 



10. Praescutum gray pruhiose. dark brown medially adirondacensis 



Praescutum with three stripes, the median one subnitidous floridana 



11. Antennae entirely yellow or with basal two segments yellow; body-coluration 



pale yellow or ochre-yellow; praescutum without distinct stripes 12 



Antennae dark, brown or black, throughout ; body-coloration yellowish 

 brown, brown, gray or polished black 14 



12. Knobs of halteres weakly darkened ; male hypopygium with the rostral pro- 



longation bifid at apex ; mesal lobe of basistyle complicated bv accessory 



lobules (Fig. 35, D) .divisa 



Halteres pale throughout; male hypopygium with the rostral prolongation 

 simple ; mesal lobe of basistyle entire 13 



13. Male hypopygium with rostral prolongation extended into a long blackened 



point (Fig. 36, F) .....pudica 



Male hvpopvgium with the rostral prolongation short, entirely pale in color 

 (Fig. '36, G) pudicoides 



14. Mesonotum polished black ^^ 



Mesonotum yellowish brown, brown or gray, generally opaque 16 



15. Male hypopygium with ventral dististyle small, narrowed gradually into the 



rostral prolongation, without a deep incision; a single rostral spine (big. 



3(3 (^) morioides 



Male hypopygium with the ventral dististyle produced into a conspicuous 

 lobe above the base of the prolongation ; rostral spine lacking ( Fig. 36. D ) _ 



nycteris 



16. Femora brown, the tips broadlv yellow; male hypopygium (Fig. 35.1) 



humidicola 



Femora without paler tips ■ ' '^ 



17. Wings with a heavy brown pattern, distributed as four or five large costal 



areas, with additional clouds at ends of longitudinal veins j ' " ■'^**^°1q 



Wings unmarked or nearly so, at most the stigma and apex darkened lo 



18. Wings with vein Sci long, subequal to or longer than m-cu 19 



Wings with vein Sci short, approximately one-half to two-thirds vicu or 



less -'' 



