174 D. W. COQUILLETT. 



41. — Wings with a brown cloud at base of second submarginal cell : face much 



produced below 42. 



Wings destitute of a brown cloud at base of second submarginal cell 43. 



42. — Front tibife provided with bristles, claws of front tarsi well developed ; ab- 

 domen not broadly reddish on the sides 3.3. edititia. 



Front tibise destitute of bristles, claws of front tarsi minute; abdomen 



broadly reddish on the sides 39. iinpi^er. 



43. — Front tibise destitute of bristles; breast and sides of abdomen destitute of 



black pile; face greatly produced below 44. 



Front tibiae provided with bristles, claws of front tarsi well develoiied....46. 



44. — Outline of brown on wings distinct, the brown color darkest outwardly. 



and much darker than the pure hyaline apex; tip of discal cell in the 



pure hyaline part 45. 



Outline of brown on wings indistinct; the brown gradually fading out, 



usually filling the discal cell to its apex 1. juiictura. 



45. — Ground color of thorax opaque, velvet-black, anal and axillary cells wholly 



brown, dark color of wings deep reddish brown 31. fiilvoliirta. 



Ground color of thorax polished black; dark color of wings pale yellowish 



brown 64. Tiilpiiia. 



46. — Brown of wings does not reach base of second submarginal cell 47. 



Brown of wings extends along the veins to base of second submarginal cell ; 

 outline of this color indistinct, the brown forming a border to the veins 



surrounding the discal cell 38. fiiiiiida. 



47. — Pile of pleura, breast, coxfe and sides of abdomen almost or entirely yel- 

 lowish, never with many black ones intermixed; brown of wings 



paler 48. 



Pile of pleura, breast and coxje largely black ; several black ones on sides 

 of abdomen ; dark color of wings opaque and very deep reddish brown, 

 not filling entire base of discal cell to small cross-vein, and scarcely 



encroaching on the third posterior cell 35. palliata. 



48. — Brown of wings nearly or quite fills entire base of discal cell to small cross- 

 vein; tomentum of occiput white 36. perplexa. 



Brown of wings does not fill entire base of discal cell to small cross-vein ; 



tomentum of occiput usually yellowish 33. edititia. 



49. — Ground color of thorax polished black; dark color of witigs pale smoky 



brown ,50. 



Ground color of thorax opaque, velvet-black; anal and axillary cells wholly 

 brown ; dark color of wings opaque, dark reddish brown. 



31. Tulvohirta. 



50. — Ground color of abdomen black, the apex alone sometimes reddish 51. 



Ground color of abdomen yellow; the first and last segments alone black ; 

 front tibije destitute of bristles ; claws of front tarsi minute. 



65. crocina. 



51. — Brown of wings fills entire base of discal cell to the small cross-vein 52. 



Brown of wings does not fill entire base of discal cell to small cross-vein ; 

 front tibife destitute of bristles; claws of front tarsi one-half as long 



as those of the middle tarsi 66. taiitilla. 



52. — Front tibise provided with bristles 53. 



Front tibife destitute of bristles; tomentum of abdomen wholly yellowish 

 white; apical fourth of discal cell pure hyaline 67. variata. 



