NO. 2024. FLIES IN SUBFAMILY BOTANOBIIN^—MALLOCH. 241 



15. Fore coxae yellow 9. convexus Loew. 



Fore coxae black 10. nigricoxa, new species. 



16. Mesonotum with 3 glossy black stripes on polliaose ground. 



11. subvittata, new species. 



Mesonotum without glossy stripes 16a 



16a. Third antennal joint above normal size, arista haired, cheeks not more than one- 

 half as high as third antennal joint 12. texana, new species. 



Third joint about the usual size and about equal to cheek. 



13. microcentris Coquillett. 



17. Frontal triangle black, with gray dusting except on a spot below front ocellus 



and one on each side of posterior ocelli 19 



18. Frontal triangle without any glossy black spots, entii-ely gray dusted. 



14. plehejus Loew. 



19. Proboscis elongated ; tibial thorn situated slightly in front of tip. 



15. proboscideus Williston. 

 Proboscis normal ; tibial thorn situated at apex of tibia 16. no6tKs Loew. 



20. Mesonotum with disk broadly brownish or blackish, gray dusted, humeri and 



pleurae as well as hind margin, or whole, of scutellum yellow. 



17. dorsatus Williston. 



21. Mesonotum reddish, brownish, or yellow, unstriped 22 



Mesonotum yellow with distinct stripes 26 



22. Mesonotum glossy brownish red, with distinct dusting; frontal triangle glossy 



black, or brown in center 18. tener Coquillett. 



23. Mesonotum yellow, frontal triangle black 19. equalis Williston. 



Mesonotum yellow, frontal triangle yellow 24 



24. Scutellum with posterior margin truncate 25 



Scutellum with posterior margin rounded 20. fiavidula, new species. 



25. Larger species, 2-3 mm.; arista distinctly pubescent; scutellum flattened, sub- 



triangular, the apical margin truncate, apical marginal bristles long, cruci- 

 ate pallidus ' Loew. 



Smaller species, 1.5 mm.; arista pubescent; scutellum shorter than broad, sides 

 slightly convergent posteriorly, width at apex equal to length; apical bristles 

 cruciate 21 . subsequaUs, new species. 



26. Mesonotum with three impressed lines generally more or less distinguished by 



blackish stripes, whiqh are very narrow '. 22. impressus Becker. 



Mesonotum with distincti broad stripes 27 



27. The stripes black on their entii-e length 23 . dorsalis Loew. 



Only the extremities of the stripes black, the remainder brownish yellow. 



24. stramineus Loew. 

 GROUP A. 



Species with Mesonotum Glossy Black, without Dusting ; Legs Entirely 



Yellow. 



1. HIPPELATES PARTITUS Becker. 



Figs. 1,2. 



Hippelates partitus Becker, Ann. Mus. Nat. Hung., vol. 10, 1912, p. 89. 



Female.— Glossy black; pale yellow on anterior half of frontal tri- 

 angle, whole of head except occiput, posterior half of frontal triangle 

 and frontal stripe on posterior half, entire legs, and halteres. Venter 



1 This species is put in a new genus, Prohippelates, but is included here for convenience. 

 95278°— Proc.N.M.vol.46— 13 16 



