ALDRICH : DOLICHOPUS AND HYGROCELEUTHUS. 3 



Hind femora of male ciliated 15 



15- The black color at tip of hind tibitt rather extended and not 



sharply limited nlbiciliatiis, Loevv. 



The black color but little extended and sharply limited. . . . 



xanthocnemus, Loew. 



SECTION B : FEMORA YELLOW. 



Group I : cilia of inferior orbit black. 



16. Cilia of inferior orbit black 17 



Cilia of inferior orbit pale . 21 



1 7. Fore coxce blackish pachycnemus, Loew. 



Fore coxae yellow 18 



18. Cilia of tegulse pale iucongruits, Wheeler. 



Cilia of tegulte black ig 



19. First two joints of antenna; yellow ilorycerns, Loew 



Whole antenna; black brevipennis, Meigen. 



Group 2: cilia of inferior orbit pale. 

 Sub-group a: cilia of tegula; pale. 



21. Tegula; with pale cilia 22 



Tegula; with black cilia 36 



22. Antennae black, first joint sometimes partly \ellowish-red . ... 23 

 Antennae chiefly or wholly yellowish-red 34 



23. Fore coxae dark at base, beyond the middle, .longinianus, Loew. 

 Fore cox£e pale 24 



24. Tip of hind tibia; distinctly black 25 



Tip of hind tibi^ not or but slightly infuscated 27 



25. Male fore tarsi enlarged albicoxa, n. sp. 



Male fore tarsi plain 26 



26. Fore tarsi ferruginous-brownish only brevimanus, Loew. 



Fore tarsi blackened from tip of first joint socius, Loew. 



27. Hind tarsi entirely black 28 



Hind tarsi to a considerable extent pale 32 



28. Hind femora of male not ciliated nudus, Loew. 



Hind femora of male ciliated ♦ 29 



29. The enlarged last joint of the male fore tarsi on the outside 



with a white reflection pahcstricus, Loew. 



The same without a white reflection 30 



30. Hind femora of male very densely ciliated. . . .splendidus, Loew. 

 Hind femora of the male sparsely ciliated 31 



31. Hind tibia; not infuscated at the tip ; fourth joint of male 



fore tarsi somewhat broader than the preceding 



splendidulus, Loew, 



