THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 23 



43. All coxae yellow, middle pair a little blackened on outer surface (Wisconsin). 



No. 132, flavicoxa, new species. 

 Middle and hind coxae black \\ith yellow tips 44. 



44. Antennae wholly black (widespread). . .No. 108, renidescens Melander and Brues. 

 First two joints of the antennae yellow; usually with a black line above (Eastern 



States) ■ ^°- ^^^' marginatus Aldrich. 



Group I. 



1. Antennae black, the first and second joints may be yellow below 2. 



First antennal joint wholly yellow 26. 



2. Antennae wholly black '^• 



First antennal joint yellow below ^• 



3. Front dark violet (California; New Mexico) No. 173, bakeri Cole. 



Front blue green (eastern species) 4. 



4. Wing with the anal angle prominent; fore coxae with black hairs on the anterior 



surface (Eastern States) No. 167, chysostoma Loew. 



Wing .with the anal angle nearly obsolete; fore coxae with minute white hairs 



(Ontario) No. 168, parvicornis, new species. 



:5. Third antennal joint twice as long as wide (Ontario). 



No. ]91, sicarius, new species. 

 Third antennal joint not much longer than wide, at most not over one and one- 

 half times as long as wide ^• 



6. Fore tarsi ornamented ' • 



Fore tarsi plain ■ • ^4. 



7. Fifth joint of fore tarsi compressed and fringed above, sometimes with very minute 



hairs ■• 



Fifth joint of fore tarsi not or but little flattened, fringed laterally 13. 



8. Hind femora ciliated below; fore tarsi with the fourth joint white, fifth black 



(Pennsylvania; Ontario) No. 194, ladniatus Coquillett. 



Hind femora without cilia below 9- 



9. First and second joints of fore tarsi of equal length 10. 



Second joint of fore tarsi not over two-thirds as long as first 11. 



10. Fore tarsi with the third joint longer than the second (Western States). 



No. 206, canaliculatus Jhomson. 

 Fore tarsi with the third joint shorter than the second (Wyoming; Colorado.). 



No. 152, seratus, new species. 



11. Fifth joint of fore tarsi only a little enlarged (Western States). 



No. 197, coquilletti Aldrich. 

 Fifth joint of fore tarsi much compressed and dilated 12. 



12. Fifth joint of fore tarsi only about one-fourth as long as fourth (widespread). 



No. 144, disdfer Loew. 



Fifth joint of fore tarsi much longer than fourth (California.) 



No. 196, talus, new species. 



13. Hypopygial lamellae incised into two lobes, so that the hyoppygium appears to 



have four lamellae (Eastern States) No. 193, quadrilamellatus Loew. 



Lamellae not incised, thick and bare (Eastern States) . . .No. 192, scoparius Loew. 



14. Hind femora with a single preapical bristle -_ 15. 



The usual preapical bristle ending a row of bristles of increasing length; outer 



posterior edge of fore coxae green 23. 



15. First antennal joint long and thick; cilia of the calypters unusually long (wide- 



spread) No. 165, penicillatus, new name. 



Antennae normal 



16. Front violet (Wyoming) No. 166, misellus Melander. 



Front green • 



