42 H. C. HUCKETT 



Calyptrae and halteres yellowish; basal segment of hj^jopygium pollinose; posthumeral 



bristles duplicated _ lipsia Walk. 



19. Fore femora at base, on anterior (inner) surface, with a conspicuous, well-defined, brown- 

 ish area; palpi spatulate; arista plumose . . .'. juvenilis Stein 



Fore femora without such an area; palpi linear; arista with long pubescence.conw^xa Stein 



Females 



1. Legs entirely blackish 2 



Hind tibiae, at least, yellowish or reddish 4 



2. Hind tibia with three anterodorsal bristles; pra as long as posterior notoplexrral bristle. 



rubivora Coq. 

 Hind tibia with two anterodorsal bristles; pra shorter than posterior notopleural bristle. . . 3 



3. Wings smokjr; proboscis slender, highly poHshed; palpi linear, but slightly dilated apicad. 



littoralis Mall. 



Wings hyaline, transparent; proboscis short and stout; not highly poUshed; palpi short 



and spatulate dissecta Meig. 



4. All femora infuscated; antennae entirely black; palpi black fringilla Mall. 



All femora largelj' yellow, or the first pair only partly infuscated 5 



5. Pra missing; r-m and m-cu cross-veins clouded; scutellum with a yellow streak on ventral 



surface affinis Stein 



Pra present; cross-veins clear; scutellum with no such marking 6 



6. Abdomen largelj- j'ellow or j-ellowish; terga occasionally with narrow, dark, posterior 



incisures 7 



Abdomen largely 'blackish or graj-ish, occasionally with narrow, light-colored, posterior 

 incisiu-es on segments 15 



7. Thorax largelj' j^ellowish 8 



Thorax largely blackish 10 



8. Bristles around posterior margin of oral ca-vdtj^ gold-colored; setulae clothing humeral 



callosities and sternopleura also gold-colored; lower calj'ptra protruding well beyond 



margin of upper unicolor Stein 



Bristles around posterior margin of oral cavity black; setulae clothing humeral callosities 

 and sternopleura black 9 



9. Mid and hind femora with a small, infuscated, apical area on dorsal smface; second seg- 



ment of arista concolorous mth base of third segment; lower calyptra protruding 



sUghtlj' but distinctly beyond margin of upper geniculata Bouch6 



Mid and hind femora with no such infuscation; second segment of arista noticeably 

 infuscated, third segment yellow; lower calyptra not protruding beyond margin of 

 upper luteola MaU . 



10. Mid and hind tarsi with segments 4 and 5 expanded into a club-shaped appendage ... 11 

 Mid and hind tarsi with segments 4 and 5 normal, not expanded into a club-shaped 



appendage 12 



11. Palpi yellow; cruciate bristles present juscojasciata Mall. 



Palpi infuscated; cruciate bristles absent winthemi Meig. 



12. Palpi infuscated; lower calyptra slightlj- but distinctly protruding beyond margin of upper. 



nigritarsis Zett. 

 Palpi yellow; lower calj-ptra not \isibly protruding beyond margin of upper 13 



13. Hind tibia with three posterodorsal bristles bicolor Wied . 



Hind tibia with two posterodorsal bristles 14 



14. Scutellum blackish vanduzeei Mall. 



Scutellimi yellowish testaceous calyptrata Zett. 



15. Palpi entirely yellow, or yellow for the most part, excepting the apex 16 



Palpi blackish or largely infuscated 18 



16. Pra shorter than posterior notopleural bristle 17 



Pra longer than posterior notopleural bristle; palpi entirely yellow; thorax with two 



distinct vittae along lines of dorsocentral bristles; arista noticeably swollen at base. 



vanduzeei Mall. 



