52 BULLETIN 143, UNITED STATES NATIONAL MUSEUM 



7. From Texas and Colorado dugesii (p. 87). 



From Arizona phoenix (p. 85). 



8. Eyes and ocelli abnormally large and prominent 9. 



Eyes and ocelli normal 10. 



9. Wings subhyaline; pubescence of abdomen from apical margin of second 



tergite white subhyalina (p. 281). 



Wings fuliginous ; pubescence of abdomen from apical margin of second 

 tergite yellow megalophthalma (p. 2S2). 



10. Postero-lateral angles of last abdominal sternite dentiform 11. 



Postero-lateral angles of last abdominal sternite rounded, not at all 



dentiform 13. 



11. Pubescence of thorax above yellowish or reddish fulvohirta (p. 66). 



Pubescence of thorax entirely black 12. 



12. Second abdominal sternite with a median pit densely filled with hairs. 



cotulla (p. 75). 

 Second abdominal sternite without a median pit, or a row of hairs simu- 

 lating a carina vandala (p. 75). 



13. Second abdominal sternite with a median pit densely filled with hairs, or 



with a median row of short, dense, stiff hairs simulating a carina.— 38. 



Second abdominal sternite plain, without any such modification; (in 



Uoculata there is usually a poorly defined pit, but it is not densely filled 



with hairs; there is occasionally a rudimentary pit in ursula) 14. 



14. Pubescence of abdominal tergites 3-6, mostly black 15. 



Pubescence of abdominal tergites 3-6 not mostly black, either red, yellow, or 



white 21. 



15. Apical abdominal segments inconspicuously grayish pubescent above 16. 



Apical abdominal segments entirely black pubescent 17. 



16. Second abdominal segment entirely ferruginous, second tergite with distinct 



separated punctures arcana (p. 217). 



Second abdominal segment black beneath, and at the base and apex above ; 

 second tergite with dense, contiguous punctures reclusa (p. 219). 



17. Tegulae punctate throughout; posterior third of mesouotum extended lat- 



erally each side into a broad distinct lobe IS. 



Posterior face of tegulae glabrous, impunctate; mesonotum not extended 

 into lateral lobes posteriorly 19. 



18. Pubescence of head, thorax, and legs black vesta (p. 105). 



Pubescence of head, thorax, and legs silvery gray columbiana (p. 119). 



19. Pubescence of mesonotum and scutellum ferruginous ; usually only apical 



half of second abdominal tergite ferruginous bioculata (p. 126). 



Pubescence of thorax entirely black; second abdominal tergite almost en- 

 tirely ferruginous 20. 



20. Second abdominal sternite ferruginous sparsa (p. 88). 



Second abdominal sternite dark mahogany red to black macra (p. 97). 



21. Body entirely black, inconspicuously clothed with grayish pubescence. 



gibbosa (p. 202). 



Body entirely black or not, but conspicuously clothed with white, yellow, 



or red pubescence 22. 



22. Apical half of second abdominal tergite clothed with red or yellowish 



pubescence 25. 



Pubescence of second abdominal tergite entirely black except the apical, and 

 sometimes subapical fringe colored otherwise 23. 



