30 THE CANADIAN ENTOMOLOGIST. 



2. 



Antennae serrate in both sexes 3 



Antennae pectinate in the male, serrate in the female, the third joint 

 about half as long as the fourth ; body narrow, elongate, rather 

 convex, the el)'tra moderately narrowed from base to apex ; 

 integuments black, shining, uniformly but not very densely clothed 

 with minute olivaceous squamules ; elytral stride deeply impressed, 

 strongly punctured, the intervals uniform and convex; scutellar 

 notch feeble. Atlantic nearctic fauna 17 



3. Epipleura in colour and vestiture similar to the marginal parts of the 



upper surface 4 



Epipleura in colour and vestiture similar to the under surface ....16 



4. Pronotum, and usually the elytra, margined at the sides with dense, 



closely-decumbent scales, which are larger, flatter and more strigose 

 than those clothing the remainder of the surface, which are very 

 small, pointed, convex, feebly or not strigose and metallic in 

 coloration, forming a more or less pronounced bloom; integuments 

 black throughout; anterior and middle tibise generally ciiiate beneath 



in the male 5 



Pronotum not vittate at the sides; body black, the elytra and epipleura 

 red ; anterior tibise ciiiate beneath in the male 15 



5. Elytral intervals flat or nearly so, sometimes feebly concave, the striae 



unimpressed or very feebly impressed and finely punctate 6 



Elytral intervals evidently though moderately convex ; equal in width, 



the deeply impressed striae strongly punctured 13 



Elytral intervals very uneven in width, strongly elevated, the string 



sulciform, with the punctures concealed by the dense vestiture of 



the sulci. ' Mexico 14 



6. Pale pronotal vittse pure white, unusually broad, dilated inwardly at 



the middle, where each is much wider than the intervening dark 

 space, the white margin at the sides and base of the elytra unusually 

 wide, the white scales having a tendency to invade also the intervals 

 within the border, from the humeral regions posteriorly ; surface 

 rather convex, the minute squamules olivaceous-green, rather dense 

 and more persistent than usual ; basal angles of the prothorax 

 slightly everted, the sides becoming strongly convergent and rounded 

 in apical third ; third antennal joint more than twice as long as the 

 second, about two-thirds as long as the fourth. Length 25.0-29.0 

 mm.; width 7.5-8.8 mm. Arizona (Yuma). \^ = stibstriatus, O. Sch.] 



Webbi, Lee, 



