26 MISC. PUBLICATION 4 7 0, U. B. DEFT. OF AGRICULTURE 



87. Each elytron with three to four strongly elevated, longitudinal, 



smooth costae extending from base to near apex, sometimes more 



or less interrupted 88 



Each elytron usually with only the first costa strongly elevated pos- 

 teriorly, other costae, if present, punctate. (14) maZf|Horn,p. 55. 



88. 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 89 



89. 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. 



90. Large species, 14-17 mm 91 



Small species, 6-13 mm 96 



91. Clypeus deeply, angularly emarginate in front 92 



Clypeus deeply, arcuately emarginate in front 93 



92. Anterior tibia of male distinctly constricted behind dilation; last 



visible abdominal sternite of female deeply, narrowly, arcuately 



emarginate at apex (71) canadensis Chamberlin, p. 165. 



Anterior tibia of male not constricted behind dilation; last visible 

 abdominal sternite of female very broadly, arcuately emarginate 

 at apex (72) californica LeConte, p. 167. 



93. Last visible abdominal sternite of female broadly rounded at apex; 



male unknown (73) vulcanica LeConte, p. 169. 



Last visible abdominal sternite of female broadly, arcuately emar- 

 ginate at apex; male known 94 



94. Apical segment of antenna distinctly transverse; semitransparent 



part of lateral lobes of male genitalia triangular (fig. 121, D) 



(74) woodgatei Champlain and Knull, p. 171. 

 Apical segment of antenna not transverse; semitransparent part of 

 lateral lobe of male genitalia of orono not triangular (fig. 121, E); 

 male of hubbardi unknown 95 



95. First costa on each elytron elevated and not interrupted posteriorly; 



last visible abdominal sternite of female deeply, arcuately emar- 

 ginate at apex (fig. 71, D) (75) orono Frost, p. 172. 



First costa on each elytron interrupted posteriorly and not elevated; 

 last visible abdominal sternite of female shallowly, arcuately 

 emarginate at apex (fig. 72, B). (76) hubbardi, new species, p. 174. 



96. Base of each elytron distinctly angulate at middle; pronotum usually 



without elevated, smooth spaces; anterior tibia of male with a 



triangular tooth near apex 97 



Base of each elytron broadly rounded at middle; pronotum with more 

 or less elevated, smooth spaces; anterior tibia of male with a 

 dilation at apex, except in chiricahuae, which has a rounded tooth 

 near apex 102 



97. Pronotum strongly flattened above _ (49 )kelloggi Knull, p. 125. 

 Pronotum moderately convex above 98 



98. Abdominal sternites (except sometimes the last) with more or less 



elevated, smooth, lateral callosities 99 



Abdominal sternites without distinct, smooth, lateral callosities 



(47) chiricahuae Knull. p. 122, 



99. 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 ex- 

 ternally 100 



100. 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,Jarcuately 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 101 



