HENRY J. FRANKLIN. 243 



17. Pile long and loose ; second abdominal segment above entirely 



covered with ferruginous-red pile ; fourth and fifth abdominal 



segments covered with very light yellow pile sylvicola. 



Pile not especially long and loose ; second abdominal segment 

 usually not covered entirely with ferruginous pile 18. 



18. Face with a conspicuous amount of yellow pile about the bases of 



the antennae ; scutellum with only a scanty posterior border 



of yellow pile ambiguus. 



Face without a conspicuous amount of yellow pile about the bases 

 of the antennae ; scutellum well covered with yellow pile.. 19. 



19. Second dorsal abdominal segment entirely covered with yellow pile ; 



mesocoxae strongly and heavily tufted with yellow pile. ...98. 

 Second dorsal abdominal segment partly covered with black or fer- 

 ruginous-red pile ; mesocoxae at most only slightly tufted 

 with yellow pile 20. 



20. Malar space longer than it is wide at the apex pleuralis. 



Malar space not longer than it is wide at the apex...rufocmctus. 



21. Face covered with yellow pile 22. 



Face with little or no yellow pile 26. 



22. Clypeus impunctate ; length of malar space about one-third the 



length of the eye 23. 



Clypeus more or less strongly punctured ; length of malar space 

 less than one-third the length of the eye 24. 



23. Front part of thorax above bearing white or very light yellow pile ; 



first five segments of abdomen above bearing tawny yellow 



pile appositus. 



Front part of thorax bearing tawny yellow pile ; only the first four 

 segments of the abdomen above bearing tawny yellow pile. 



borealis. 



24. Only one dorsal abdominal segment covered with other than 



black pile vosnesenskii. 



More than one dorsal abdominal segment covered with other than 

 black pile 25. 



25. Fifth abdominal segment covered above with black pile...liuntii. 

 Fifth abdominal segment not covered above with black pile. 



occidentalis. 



26. Dorsum of thorax entirely covered with light or yellow pile; at 



most only a small black spot present on the disc between 



the bases of the wings 27. 



Dorsum of thorax not nearly entirely covered with light or yellow 

 pile; either the entire posterior half black, or at least a very 

 noticeable black spot or band between the bases of the 

 wings 30. 



27. All dorsal abdominal segments beyond the second entirely covered 



with black pile perplexus. 



Not all so covered 28. 



TRANS. AM. ENT. SOC, XXXVIII. 



