92 D.'W. COQUILLETT. 



9. — Anterior branch of third vein connected with the second by a cross-veiu 



forming three subraarginal cells 10. 



Anterior branch never connected with the second vein ; only two submar- 



giual cells 15. 



10. — Wings with four posterior cells, anal cell open , 11. 



Wings with only three posterior cells, anal cell closed. 



Rhobilopselaphtis. 



11. — First posterior cell ojien 12. 



First posterior cell closed Paiitarbes. 



12.— Body more or less pilose, tibise. bristly 13. 



Body naked, tibiie destitute of bristles AnipliicosillUS. 



13. — Antennae as long as the head, the third joint not longer than the first two 



taken together 14. 



Antennae less than one-half as long as the head, the third joint twice as 



long as the first two Exepacmiis n. gen. 



14. — First antennal joint scarcely thicker than the second 32. 



First antennal joint twice as thick as the second Ploas. 



1,5. — Wings with four posterior cells 16. 



Wings with only three posterior cells, anal cell closed 30. 



16. — First posterior cell open 17- 



First posterior cell closed 26. 



17. — Anal cell open 19. 



Anal cell closed 18. 



18. — Proboscis not projecting beyond the epi.stoma Oiicodocera. 



Proboscis projecting far beyond the epistoma I'Utliiria. 



19. — Body more or less pilose, tibiae usually bristly 21. 



Body naked, tibiae destitute of bristles 20. 



■20. — Ocellar tubercle situated near hind edge of the front, marginal cell strongly 



expanded at its tip Paracosiuus. 



Ocellar tubercle situated near the center of the front, marginal cell only 



slightly expanded at its tip Metacosiuus. 



21. — Antennie and abdomen destitute of long scales 22. 



Antenuffi and abdomen provided with such scales Liepi<lopliora. 



22. — Third antennal joint lanceolate, scarcely longer than the first 23. 



Third antennal joint bulbous at the base, the remaining portion styliform, 



first joint not one-half as long as the third 24. 



23. — Base of second submarginal cell almost opposite apex of discal cell, ai)ex of 

 second submarginal cell less than one-half as broad as the length of this 



cell, body elongate and slender 34. 



Base of second submarginal cell far beyond apex of discal cell, apex of 

 second submarginal cell as broad as the length of this cell, body short 



and rather robust Spariiopoliiis. 



24. — Third antennal joint much longer than wide, contracted into a style at 



least half as long as the thickened base 25. 



Third antennal joint scarcely longer than wide, not contracted into a style 



at its apex Eucessia. 



25. — Face in profile concave, projecting forward below Epaeiiius. 



Face convex, retreating below Aplicebaiitus. 



26. — Anal cell open, proboscis projecting far beyond the epistoma 33. 



Anal cell closed, proboscis retracted within the oral cavity..Oucodocera. 



