Platvxix.e 129 



four small, feeble and indistinct punctures; anterior male tarsi 

 narrowly dilated. Length (cf) 6.0 mm.; width 2.35 mm. Mon- 

 tana, — Knaus collusor n. sp. 



Sides of the elytra distinctly more rapid in curvature at base 7 



7 — Species of rather large size for the present genus 8 



Species smaller 9 



8 — Form elongate-suboval, rather convex, deep black and polished, 

 the elytra dark piceous, under surface black, the legs arid epipleura 

 pale; head elongate-suboval, much narrower than the prothorax, 

 the eyes not prominent; antennae rather more than half as long as 

 the body, the first joint rufous, two to four blackish, the remainder 

 pale ferruginous; prothorax as long as wide, with moderately arcu- 

 ate and rather strongly reflexed sides, becoming more oblique and 

 less rounded posteriorly, still more refiexed basally, where they 

 form the outer wall of the rather large and smooth, irregularly 

 sublinear impressed foveae; apex feebly sinuate, with very blunt 

 angles, rather wider than the base, the basal angles broadly rounded 

 as usual; surface with some short transverse rugulae and a fine 

 impressed median stria; elytra oblong-oval, nearly three-fifths 

 longer than wide, three-fifths wider than the prothorax, obtusely 

 rounded at apex, the sinus rather long and evident; striae fine, 

 smooth; intervals almost flat, the third with four — sometimes five — 

 small punctures; met-episterna small, not one-half longer than 

 wide. Length (9) 7.5 mm.; width 2.8-2.9 n^m- ^- Dakota 

 (Devil's Lake), — Wickham; also one from British Columbia 



(Vernon) and another labeled "Kansas." symmetricus n. sp. 



Form elongate-suboval, convex, polished, black, the elytra barely at all 

 less black, the legs obscure rufous; head less elongate and with 

 more prominent eyes; antennae slender, fully half as long as the 

 body, the first four joints blackish, the remainder brownish-fer- 

 ruginous; prothorax subquadrate, apparently somewhat longer than 

 wide, the parallel sides evenly and moderately arcuate and strongly 

 reflexed, more so basally, the angles broadly rounded; foveae 

 smaller, sublinear but broadly and very feebly impressed; apex not 

 wider than the base, feebly sinuate, with very blunt angles; median 

 stria entire; elytra three-fifths longer than wide, two-thirds wider 

 than the prothorax, more evenly rounded at apex than in the 

 preceding, the sinus rather distinct; striae finer, in fact extremely 

 fine, smooth, the intervals flat, the third with about four very 

 minute punctures; met-episterna slightly more elongate; tarsi 

 similarly very slender, with two rather coarse grooves. Length 

 (9) 8.0 mm.; width 2.9 mm. New Hampshire (Durham). 



properans n. sp. 

 9 — Form unusually stout, rather convex, shining as usual in both sexes, 

 black, the reflexed thoracic margins faintly piceous, the elytra 

 dark piceous; under surface black, the epipleura and legs rufous; 

 head two-thirds as wide as the prothorax, only slightly elongate, 

 the eyes moderate in size and prominence; antennae very slender 

 and filiform, having unusually elongate joints, fully three-fifths as 

 T. L. Casey, Mem. Col. IX, Jan. 1920. 



