34 THE CANADIAN ENTOMOLOGIST. 



17. Elytra ( 5 ) nearly two and one-half times as long as wide, the strial 



punctures toward the sides moderately coarse and well separated ; 

 basal an<j;les of the prothorax gradually and feebly everted. Length 



24.0 mm.; width 6.2 mm. Pennsylvania viridipi/is, Say 



Elytra ( $ ) but little more than twice as long as wide, the sulci 

 toward the sides very coarsely punctate or closely foveate ; basal 

 angles of the prothorax abruptly and feebly everted and more 

 obtuse. Length 20.C-22 o mm.; width 5.7-6.0 mm. North 

 Carolina and District of Columbia debilis, n. sp. 



18. Median part of the prosternum narrow, parallel and flat from the 



anterior lobe to the coxje ; elytra parallel and straight at the sides 

 from the base to slightly behind the middle, then but just visibly 

 converging to the rather broadly rounded tip ; elytra! strife very 

 finely punctate, unimpressed ; last ventral segment ( ? ) short and 

 much more than twice as wide as long ; tibiae not ciliate beneath in 

 the male ; vestiture only moderately dense, green, varying to 

 coppery in colour. Length ( $ and 9 ) 26.0-29.0 mm.; width 

 6.8-7.5 'ii'ii- Arizona (San fJernardino Ranch, Cochise Co.), 



Snow rectus, n. sp. 



Median part of the prosternum broadly convex anteriorly near the 

 apical lobe ig 



19. The median part becoming narrow, parallel and flat from before the 



middle to the coxre ; elytra shorter and broader tlian in rectus, 

 parallel, rounded at the sides of the apex; striae scarcely impressed, 

 the punctures fine ; last ventral ( $ ) relatively narrower and less 

 abbreviated, less than twice as wide as long ; vestiture dense, 

 uniform and bright bluish-green in colour. Length 27.0 mm.; width 



7.3 mm. Arizona sinaragdiniis, Lee. 



The median part broader, flattened and with posteriorly converging 

 sides from very near the lobe to the coxse ; elytra still shorter and 

 broader, parallel to slightly behind the middle, then rather strongly 

 narrowed and with moderately arcuate sides to the tip, which is 

 relatively narrower than in the two preceding species ; sculpture 

 similar ; last ventral ( 9 ) strongly trapezoidal, more than twice as 

 wide as long ; vestiture very dense, almost uniform greenish-blue, 

 sometimes variegated with cobalt-blue ; male much more slender 

 than the female, as in the two preceding species. Length ( $ and 

 9 ) 28.0-30.0 mm.; width 7.4-8.0 mm. Arizona (Bill Williams 

 Fork and Congress Junction), Snow ostcntns, n. sp. 



