184 Journal New York Entomological Society. [Voi. xv. 



3. Legs mostly red parallels Say. 



Legs mostly dark ; red, if any, confined to hind legs 4 



4. Hair bands cream colored, very broad ; tegulse almost impunctate. 



farinostis Smith. 

 Hair bands white, narrow ; tegul?e punctured except medially. 



lerouxii Lepeletier. 



5. Second transverse cubital not obsolescent 6 



Second transverse cubital obsolescent 16 



6. Base of metathorax finely wrinkled! 7 



Base of metathorax coarsely rugose 13 



7. Mesothorax almost impunctate titusi Crawford. 



Mesothorax closely punctured 8 



8. Truncation of metathorax surrounded by a salient rim .fiiscipentiis Smith. 



Truncation not surrounded by a salient rim 9 



9. Punctures of mesothorax very dense, separated from each other by less than their 



own diameter tardus Cresson. 



Punctures of mesothorax more sparse, widely separated, at least medially 10 



10. Hind tibiae, hind and middle tarsi red 7iiellipes Crawford. 



Legs dark il 



11. Base of metathorax separated from truncation by a sharp x\6.^&...coriacetis Smith. 

 Base of metathorax without a sharp ridge at rear 12 



12. Wings yellowish, hair bands creamy or yellowish trizonafus Cresson. 



Wings grayish, hair bands white .forbesii Robertson. 



13. A band on the middle of first segment ; wings very clear sisymbrii Cockerell. 



No band on first segment ; wings more dusky 14 



14. Rugae finer, straight, parallel <?/)'////?> Cockerell. 



Rugae coarse, irregular, not parallel 15 



15- Base of metathorax with a semicircular enclosure .pacificus Cockerell. 



Base of metathorax without a semicircular enclosure similis Smith. 



16. Abdomen red 17 



Abdomen not red 19 



17- Pubescence of head and thorax appressed, mesothorax very shiny, almost im- 

 punctate ; abdomen with apical segments largely black arizonensis n. sp. 



Pubescence of head and thorax not appressed 18 



18. Facial quadrangle much longer than broad, punctures of head strong. 



ovaliceps Cockerell. 

 Facial quadrangle not much longer than broad, punctures of head indistinct. 



swenki Crawford. 



19. Tegulae large, punctured all over 20 



Tegulae not large and punctured all over 22 



20. Metathorax with a small triangular enclosure nehanbonis Robertson. 



No triangular enclosure on metathorax 21 



21. Mesothorax coarsely punctured kincaidii Cockerell. 



Mesothorax finely punctured glabriventris Crawford. 



22. Legs entirely light testaceous birkmanni Crawford. 



Legs mostly dark 23 



23. Metathorax except basal enclosure covered with pubescence concealing the 



surface, especially on truncation 24 



