314 U. S. NATIONAL MUSEUM BULLETIN 216 



12. Dorsal edge of hind tibia sparsely hairy, some of the hair sockets separated 



by more than the length of the hairs; tegula black; wings slightly infuscate. 



14. nudus (Townes) 



Dorsal edge of hind tibia closely hairy, the hair sockets separated by less 



than the length of the hairs and not sparser than on the rest of the tibia; 



tegula white, brownish, or rarely black; wings hardly at all infuscate . 13 



13. Face sparsely punctate; metapleurum densely punctate and more or less 



striolate; front tibia moderately swollen at middle; middle tibia dusky 



fulvous basad of its white band 13. aequalis (Provancher) 



Face densely punctate; metapleurum rather sparsely punctate; front tibia 

 rather strongly swollen at middle; middle tibia blackish basad of its white 

 band 15. annulipes (Brull6) 



14. Males 15 



Females 18 



15. Epipleurum of second tergite about 2.2 as long as wide; tegula white. 



16. punicipes (Cresson) 



Epipleurum of second tergite 4.0 to 8.0 as long as wide; tegula white to black, 



or white basally and brownish apically 16 



16. Hind tibia uniformly fulvous with its apical 0.1±somewhat infuscate; punc- 



tures on lower hind part of mesopleurum moderately coarse, their inter- 

 spaces nearly always less than their diameter; front wing 5.4 to 9.0 mm. 

 long; second to fourth segments of maxillary palpus brown. 



9. sanguinipes (Cresson) 



Hind tibia usually more or less infuscate with a more or less distinct paler 



band subbasally ; punctures on lower hind part of mesopleurum rather fine, 



their interspaces about twice their diameter; front wing 3.5 to 7.2 mm. 



long 17 



17. Tegula entirely white or whitish basally and brownish or blackish apically, 



sometimes entirely brown or blackish; epipleurum of second tergite about 

 6.0 as long as wide. (Often not separable with certainty from the following 



two species) 8. varians, new species 



Tegula usually entirely white, entirely brown, or black; epipleurum of second 

 tergite about 4.5 as long as wide. (Not separable with certainty from the 



above species.) 11. hesperus, new species 



12. stricklandi, new species 



18. Epipleurum of second tergite very narrowly wedge-shaped, about 4.2 as long 



as wide 19 



Epipleurum of second tergite more broadly wedge-shaped, about 2.0 as long 

 as wide 20 



19. Punctures on lower part of mesopleurum fine and distant, separated by about 



twice their diameter, the mesopleurum near base of middle coxa sometimes 

 with fine oblique wrinkles in addition to the punctures; metapleurum with 

 fine oblique wrinkles and finely punctate; hind tibia varying from uniformly 

 fulvous to fuscous with a pale submedian band . . 8. varians, new species 

 Punctures on lower part of mesopleurum coarse and close, separated by less 

 than their diameter, the mesopleurum near base of middle coxa usually 

 with moderately coarse, oblique wrinkles between the punctures; meta- 

 pleurum moderately, strongly, obliquely rugosopunctate; hind tibia uni- 

 formly fulvous except that its apex may be infuscate. 



9. sanguinipes (Cresson) 



