22 MISIC. PUBLICATION 1 4 70, U. S, DEFT. OF AGRICULTURE 



26. Clypeus semicircularly emarginate in front 27 



Clypeus not semicircularly emarginate in front 30 



27. Presternum distinctly, broadly lobed in front; small species, 6 to 



9 mm 28 



Prosternum arcuately rounded in front, but not distinctly lobed; 



large species, 10 to 12.5 mm 29 



28. Male genitalia long and slender, sides nearly parallel (fig. 113, F) 



(22) prosopidis, new species, p. 70. 

 Male genitalia short and robust, sides arcuately rounded (fig. 116, C). 



(23) debilis LeConte, p. 72. 



29. Clypeus with a distinct tooth on each side of emargination 



(24) edwardsii Horn, p. 74. 

 Clypeus broadly rounded on each side of emargination 



(25) schaefferi Obenberger, p. 76. 



30. Pronotum uniformly convex 31 



Pronotum more or less flattened (14) mali Horn, p. 55. 



31. Clypeus deeply emarginate in front; anterior tibia of male with a 



number of small teeth on inner margin near apex; last visible 

 abdominal sternite of female broadly depressed, with a longi- 

 tudinal, median carina__ 32 



Clypeus not deeply emarginate in front; anterior tibia of male with a 

 broad tooth or dilation near apex; last visible abdominal sternite 

 of female not longitudinally carinate 33 



32. Posterior femur coarsely dentate on outer margin 



(26) basalis LeConte, p. 78. 

 Posterior femur not dentate on outer margin 



(27) octocola LeConte, p. 80. 



33. Clypeus acutely incised at middle, dentate on each side of incision. _ 34 

 Clypeus broadly, arcuately or angularly emarginate in front, not 



dentate on each side of emargination 35 



34. Species from West Coast (California, Oregon, Washington, Idaho, and 



Nevada) (28) semisculpta LeConte, p. 83. 



Species from Southwest (Arizona, New Mexico, Colorado, and Utah) 



(29) cuprascens LeConte, p. 86. 



35. Last visible abdominal sternite longitudinally concave 



(30) peninsularis Schaeffer, p. 88. 

 Last visible abdominal sternite not longitudinally concave 36 



36. Intermediate segments of antenna distinctly wider than long; elytra 



strongly angulated at bases 37 



Intermediate segments of antenna not distinctly wider than long; 

 elytra obtusely rounded at bases (31) texana LeConte, p. 90. 



37. Base of each elytron abruptly angulated at middle, transverse ex- 



ternally (32) helferi, new species, p. 92. 



Base of each elytron not abruptly angulated at middle, oblique 



externally 38 



38. Anterior tibia of male with a slender, acute tooth one-third from apex, 



and the apex of eighth abdominal tergite broadly rounded or 

 vaguely emarginate; last visible abdominal sternite of female 

 narrowly, arcuately emarginate at apex 



(33) ignicollis Horn, p. 94. 



Anterior tibia of male with a broad, triangular tooth near apex, and 



the apex of eighth abdominal tergite angularly produced; last 



visible abdominal sternite of female subtruncate or shallowly 



emarginate at apex 39 



39. Elytra uniformly reddish cupreous or brownish cupreous 



(34) speculifer Horn, p. 96. 

 Elytra aeneous, with a greenish reflection on basal halves, reddish 

 cupreous, frequently with a purplish reflection on apical halves 



(35) iris Van Dyke, p. 99. 



40. Anterior femur with a distinct tooth 41 



Anterior femur without a distinct tooth 56 



41. Elytra with distinct discal foveae 42 



Elytra without distinct discal foveae 48 



42. Surface above green or bluish green. (36) viridicyanea Horn, p. 100. 

 Surface above brown, brownish black, or cupreous 43 



43. Pronotum unicolored 44 



Pronotum bicolored 46 



