46 BULLETIN 143, UNITED STATES NATIONAL MUSEUM 



17. Pubescence of dorsums of thorax and abdomen concolorous 18. 



Pubescence of dorsum of thorax whitish, with scattered, erect, black hairs ; 



a triangular black spot of black pubescence anteriorly and posteriorly, 

 the latter not as conspicuous as the former ; pubescence of second tergite 

 scarlet dugesii (p. 87). 



18. Pubescence of body above, principally scarlet foxi (p. 84), 



Pubescence of body above whitish, slightly tinged with yellow. 



phoenix (p. 85). 



19. Entire insect clothed with long, coarse, white hairs 20. 



Pubescence of body and legs colored otherwise 21. 



20. Pygidium irregularly rugose; color of body and legs red; genae rounded 



posteriorly gloriosa (p. 242). 



Pygidium prominently longitudinally striate ; color of body and legs black- 

 ish ; genae bounded posteriorly by an obscure carina_pseudopappus (p. 243) . 



2L Pygidium pubescent hollii (p. 277). 



Pygidium not pubescent ^^-.r-^-— 22. 



22. Scutellar scale evident, usually prominent ^f^^^^^^^. 29. 



Scutellar scale entirely absent 23. 



23. Genae not as coarsely punctured as the front and vertex, rounded at the 



posterior margin 24. 



Genae very coarsely punctured like the front and vertex, the posterior 

 margins defined by a distinct carina ; pubescence brilliant crimson. 



fulgida (p. 76). 



24. Pubescence of abdominal tergites 2-5 concolorous, rather dense, and erect_25. 

 Pubescence of abdominal tergites 2-5 not concolorous, sparse 26. 



25. Pubescence of head and thorax black, that of the abdomen fulvous. 



nupera (p. 103). 



Pubescence of front, vertex, thorax above, and abdomen above concolorous, 



ochraceous stevensi (p. 99) . 



26. Second abdominal tergite with very large, separated, foveate punctures, 



each bearing an erect hair ; no other pubescence on disk of second tergite. 



dionysia (p. 104). 



Second abdominal tergite with close, large elongate punctures; the 



pubescence of the second tergite mostly recumbent 27. 



27. Apical fringes of first and second abdominal tergites entirely pale. 



texanella (p. 96). 

 Apical fringes of first and second abdominal tergites in part pale 28. 



28. Lateral extremes and median spot of apical fringe of second abdominal 



tergite silvery, the interspaces black sparsa (p. 88). 



Only lateral extremes of apical fringe of second tergite silvery ; remainder 

 of apical fringe black sparsa var. segregata (p. 93). 



29. Postero-lateral angles of the head prominent; conspicuously carinate or 



tuberculate 30. 



Postero-lateral angles of the head not prominent ; not conspicuously carinate 

 or tuberculate 47. 



30. Head, thorax, and abdomen clothed above with long, dense, erect 



pubescence 31- 



Head, thorax, and abdomen above with sparse, appressed pubescence 32. 



31. Pubescence of second tergite, except basal fourth, and third tergite entirely, 



yellow californica (p. 181). 



Apical margin of second tergite medially, and third tergite medially, with 

 black pubescence californica var. clio (p. 184). 



