38 KANSAS UNIVERSITY SCIENCE BULLETIN. 



10. Third longitudinal vein curving forward confluens Loew. 



Third longitudinal vein straight grata Loew. 



11. Antenna;, except sometimes the arista, wholly black 12 



Antennte not wholly black 14 



12. Legs largely black ap2)ropinqua, n. sp. 



Legs largely yellow 13 



13. Frontal triangle wholly black melanocera Loew. 



Frontal triangle with two oval spots liturata, n. ep. 



14. Palpi largely black 15 



Palpi yellow 20 



15. Arista black crocota Loew. 



Arista largely whitish 16 



16. Face marked with black 17 



Face not marked with black 18 



17. Face with two black lines eucera Loew. 



Face with four black lines sanguinolenta Loew. 



18. Clypeus black on sides maculosa Loew. 



Clypeus yellow 19 



19. Third antennal joint wholly black puhescens Loew. 



Third antennal joint not wholly black palpalis, n. sp. 



20. Mesonotum without distinct markings 21 



Meeonotum with distinct markings 22 



21. Pleurae immaculate unicolor Loew. 



Pleurje spotted microeera Loew. 



22. Mesonotum with three black vittae 23 



Mesonotum with five black vittje 27 



Meeonotum largely red, with two grayish lines alternata Loew. 



23. Third vein curving forward 24 



Third vein straight or nearly so 26 



24. Third antennal joint wholly black gundlachi Loew. 



Third antennal joint black at apex 25 



25. Arista black p><^'>'^'C'^ d- sp. 



Arista largely white versicolor Loew. 



26. Front with a longitudinal sulcus mellea Loew. 



Front without such sulcus assimilis Macq. 



27. Arista white, at most base yellow 28 



Arista not white, at least base brown or black 30 



28. Third antennal joint wholly black 29 



Third antennal joint with apex black rubicunda, n. sp. 



29. Clypeus black aristalis Coq. 



Clypeus yellow trivittata Will. 



."^O. Humeri usually with black spots 31 



Humeri not with black spots 38 



31. Face much produced below producta Loew. 



Face not produced below '. 32 



32. Clypeus wholly black or brownish black 33 



Clypeus black only on the sides 34 



