A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 27 



101. 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. 



102. Body beneath (except legs) brownish or cupreous, sometimes with a 



faint greenish reflection 103 



Body beneath bright green to bronzy green, except in females of 

 sylvania and laricis, which have the underside of the body more 

 or less purplish cupreous, with a distinct bronzy-green tinge 107 



103. Posterior tibia of male arcuate; last visible abdominal sternite of 



female broadly, arcuately emarginate at apex (fig. 73, D) 



(77) scabripennis Castelnau and Gory, p. 175. 



Posterior tibia of male straight; last visible abdominal sternite of 



female with a small semicircular or triangular emargination at 



apex, if broadly emarginate the emargination limited at bottom 



by a deflexed plate 104 



104. Dilation on anterior tibia of male abruptly narrowed at apex (fig. 66, 



A) ; last visible abdominal sternite of female with the emargina- 

 tion at apex limited at bottom by a thin plate, the anterior margin 

 of plate truncate or sinuate (fig. 66, D) _ (69) caurina Horn, p. 161. 

 Dilation on anterior tibia of male not, or only slightly, narrowed at 

 apex (fig. 74, A); last visible abdominal sternite of female with 

 the emargination at apex not limited at bottom by a thin plate, 

 except in falli, which has the anterior margin of the plate smooth, 

 and arcuately emarginate or truncate. 105 



105. Median lobe of male genitalia truncate at apex, last visible ab- 



dominal sternite of female with a deflexed plate or very small, 



triangular notch at apex 106 



Median lobe of male genitalia acute or narrowly rounded at apex 

 (fig. 122, A); last visible abdominal sternite of female with a 

 small, semicircular emargination at apex (fig. 74, D) 



(78) trinervia (Kirby), p. 178. 



106. Sides of median lobe of male genitalia slightly converging to apex, 



which is broadly truncate (fig. 122, B) ; last visible abdominal 

 sternite of female with the emargination at apex limited at 

 bottom by a thin plate, which is truncate or arcuately emar- 

 ginate at apex (fig. 75, D) (79) falli Van Dyke, p. 180. 



Sides of median lobe of male genitalia strongly converging to apex, 

 which is narrowly truncate (fig. 122, C) ; last visible abdominal 

 sternite of female with a very small, triangular notch at apex 

 (fig. 76, D) (80) breviloba Fall, p. 182. 



107. Prosternum of male densely pubescent; female with the abdomen 



beneath purplish cupreous, with a bronzy-green tinge, and the 



last visible sternite deeply emarginate at apex . 108 



Prosternum of male sparsely pubescent; female with the abdomen 

 beneath green at middle, becoming purplish cupreous at the 

 sides, and the last visible sternite broadly, shallowly emarginate 

 at apex 109 



108. Dilation on anterior tibia of male abruptly narrowed at apex, tibia 



strongly constricted behind the dilation (fig. 77, A) 



(81) laricis Van Dyke, p. 184. 

 Dilation on anterior tibia of male not abruptly narrowed at apex, 

 tibia slightly constricted behind the dilation (fig. 78, A) 



(82) sylvania Fall, p. 187. 



109. Dilation on anterior tibia of male twice as long as wide (fig. 79, A) ; 



male genitalia broad, with the sides of median lobe slightly con- 

 verging to apex, which is broadly rounded (fig. 122, F) 



(83) carinipennis LeConte, p. 189. 

 Dilation on anterior tibia of male not twice as long as wide (fig. 80, A) ; 

 male genitalia slender, with the sides of median lobe strongly 

 converging to apex, which is acutely rounded (fig. 123, A) 



(84) pseudotsugae Van Dyke, p. 191. 



110. Elytra with either longitudinal costae or discal foveae 111 



Elytra without distinct longitudinal costae or discal fovae 135 



111. Lateral margins of last visible abdominal sternite more or less inter- 



rupted, but not serrate 112 



Lateral margins of last visible abdominal sternite entire 113 



