84 Trans. Acad. Sci. of St. Louis. 



slightly longer than wide and with the sides diverging feebly from the 

 basal angles throughout; legs stout; integuments coarsely and sparsely 

 punctate anteriorly, the punctures of the elytra smaller, irregularly 

 disposed, of the abdomen very flue and moderately close-set; head in 

 the male as wide as the base of the elytra but narrower than the apex, 

 formed as usual but with the sides more rounded toward base; protho - 

 rax subequal in width to the head and base of the elytra, distinctly longer 

 than wide, feebly narrowed from apex to base; abdomen as wide as the 

 elytra, parallel. Male with the fifth ventral wholly unmodified, the 

 sixth narrowly flattened along the median line toward base, the surface 

 feebly and narrowly prominent in the middle at apex, the latter rectilin- 

 early truncate and unmodified throughout; female with the sixth 

 segment feebly lobed at tip. Length 9.8 mm.; width 1.4 mm. Illi- 

 nois armatum Say 



9 — Head large, as wide as the elytra or wider; gular sutures moderately 



separated, straight and parallel; elytra bicolored, red, black toward 



base 10 



Head small, narrower than the elytra, with more broadly rounded basal 

 angles; elytra uniform in color throughout and concolorous 11 



10 — Form rather stout, parallel, normally convex, shining, black, the elytra 



and legs bright rufous, the former black in rather less than basal half 

 toward the suture and less toward the sides; antennae obscure rufous; 

 head large, slightly wider near the base than at the eyes, the latter 

 moderate, the sides nearly straight with the angles moderately rounded; 

 punctures coarse, rather close-set toward the sides, almost wanting 

 on the vertex; prothorax a fourth longer than wide, much narrower 

 than the head, feebly narrowed posteriorly throughout, the sides nearly 

 straight, the angles rather well rounded; punctures coarse, moderately 

 sparse, confused, the smooth median line not defined by punctured 

 series; elytra more depressed, slightly elongate, about as long as the 

 prothor-ax and slightly wider, the sides nearly straight and feebly diverg- 

 ing from base to apex, the punctures less coarse than those of the 

 prothorax, rather sparse and confused; abdomen parallel, not quite as 

 wide as the elytral apex, the punctures minute and close-set. Male 

 wanting; female with the apex of the sixth ventral very broadly 

 rounded and briefly lobed. Length 7.0 mm.; width 1.1 mm. British 



Columbia diyisum Leo. 



Form nearly similar but more slender, the coloration, lustre and sculpture 

 similar, except that the punctures throughout are somewhat sparser; 

 head not so large, the sides parallel and nearly straight for almost 

 twice the length of the eyes behind the latter, the angles right and mod- 

 erately rounded as usual; antennae rufous, not as long as the head and 

 prothorax, thick, filiform, the median joints very slightly longer than 

 wide; prothorax nearly as in divisum but only slightly narrower than 

 the head, very feebly narrowed from apex to base ; elytra slightly wider 

 than the prothorax, equal in length to the latter in the female, a very 

 little shorter in the male, slightly longer than wide, the sides feebly 

 diverging from the base; abdomen as in divisum. Male with the fifth 

 and sixth ventrals unimpressed, the latter broadly arcuato-truncate at 

 apex, the surface at the apex with two small approximate tufts of short 



