A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 21 



10. Foveae on elytra distinct, interrupting the longitudinal costae 



(5) deleta LeConte, p. 38. 

 Foveae on elytra obsolete, not or only vaguely interrupting the 



longitudinal costae 11 



11. Clypeus arcuately emarginate in front; last visible sternite of female 



broadly rounded at apex; male known 



(6) chamberlini, new name, p. 40. 

 Clypeus triangularly emarginate in front; last visible sternite of 

 female strongly bisinuate at apex; male unknown 



(7) bisinuata Chamberlin, p. 42. 



12. Anterior tibia of male with a distinct, rounded dilation near apex; male 



genitalia constricted at the sides (8) deserta Horn, p. 43. 



Anterior tibia of male without a distinct dilation near apex; male 

 genitalia arcuately rounded at the sides 



(9) atriplexae, new species, p. 45. 



13. Anterior femur with an acute tooth; last visible abdominal sternite of 



male broadly, shallowly emarginate at apex, of the female trans- 

 versely sinuate at apex (10) grindeliae Van Dyke, p. 47. 



Anterior femur with an obtuse tooth; last visible abdominal sternite 

 of male deeply, arcuately emarginate at apex, of the female 

 broadly rounded or slightly notched at apex 



(11) fragariae Fisher, p. 49. 



14. Dorsal surface of body with distinct hairs 15 



Dorsal surface of body with indistinct hairs 17 



15. Lateral margins of elytra distinctly serrate posteriorly 



(12) pubescens Fall, p. 51. 

 Lateral margins of elytra not distinctly serrate posteriorly 16 



16. Each elytron with four more or less distinct, longitudinal costae; dila- 



tion on anterior tibia of male obtusely angulated at apex 



(13) oregona Chamberlin, p. 53. 



Each elytron without, or with only one or two more or less distinct, 



longitudinal costae; dilation on anterior tibia of male broadly 



rounded at apex (11) fragariae Fisher, p. 49. 



17. Lateral margins of elytra distinctly serrate posteriorly 18 



Lateral margins of elytra not distinctly serrate posteriorly 21 



18. Each elytron with three to four strongly elevated, longitudinal costae 



extending from base to near apex, sometimes more or less inter- 

 rupted 19 



Each elytron usually with only the first costa strongly elevated 

 posteriorly (14) mail Horn, p. 55. 



19. Head and pronotum brilliant reddish cupreous, the latter not dis- 



tinctly sulcate at middle (15) lineatipennis Van Dyke, p. 58. 



Head and pronotum not brilliant reddish cupreous, the latter dis- 

 tinctly sulcate at middle 20 



20. Dilation on anterior tibia of male nearly one-third as long as tibia 



(16) beyeri Schaeffer, p. 59. 

 Dilation on anterior tibia of male scarcely one-fourth as long as tibia 



(17) bacchari Van Dyke, p. 61. 



21. Elytra with distinct greenish or cupreous foveae; lateral margins of 



last visible abdominal sternite distinctly serrate 



(18) purpurata Bland, p. 63. 

 Elytra without distinct greenish or cupreous foveae; lateral margins 



of last visible abdominal sternite not distinctly serrate 



(19) aeneola LeConte, p. 65. 



22. Body above uniformly bright bronzy green__(20) humilis Horn, p. 67. 

 Body above bluish to violaceous black, and each elytron with a large 



reddish-cupreous humeral spot 



(21) cupreohumeralis Van Dyke, p. 68. 



23. Lateral margins of last visible abdominal sternite serrate 24 



Lateral margins of last visible abdominal sternite not serrate, rarely 



interrupted 110 



24. Disk of pronotum even, without a distinct median depression (some- 



times vaguely depressed) or elevated callosities 25 



Disk of pronotum uneven, longitudinally sulcate at middle, and fre- 

 quently with elevated callosities 58 



25. Abdominal sternites (except sometimes the seventh) with distinct, 



more or less elevated, smooth, lateral callosities 26 



Abdominal sternites without distinct, smooth, lateral callosities 40 



