June 1900.] Casey : On North American Coleoptera. Ill 



8 — Body regularly elongate-oval and strongly convex, black, the legs and elytra rufo- 

 piceous ; antennse dark testaceous, the club unusually stout and deep black ; 

 pubescence short and not dense ; basal joint of the antennae unusually large and 

 stout but of the usual form ; prothorax barely two-fifths wider than long, the sides 

 distinctly converging, broadly and almost evenly arcuate from base to apex and 

 almost continuous with those of the elytra, the punctures fine and moderately 

 close ; elytra oval, two-thirds longer than wide, sensibly widest and feebly 

 inflated before the middle, arcuately narrowed thence to the apex, which is 

 rather narrowly rounded, the punctures very fine and quite sparse. Length 1. 7 

 mm. ; width 0.7 mm. Colorado capitata, sp. nov. 



Body oblong, parallel and subdepressed, much larger, moderately shining, dark rufo- 

 piceous throughout, the legs and antenna; but little paler ; pubescence short but 

 coarse and sparse, even as usual ; antenna: moderate, the first two joints of the 

 club transverse ; prothorax unusually developed, parallel, but little wider than 

 long, the sides feebly, almost evenly arcuate from base to apex ; punctures fine 

 but strong, moderately close, the basal impression very fine and shallow along the 

 middle of the basal margin, elsewhere obsolete ; elytra three-fourths longer than 

 wide, but little wider than the prothorax, the sides broadly, feebly arcuate, grad- 

 ually arcuato-convergent from about the middle, the apex somewhat broadly 

 rounded ; punctures very fine and relatively sparse, somewhat disposed to linear 

 arrangement. Length 1.9 mm.; width 0.72 mm. Colorado — Mr. Schmitt. 



quadricollis, sp. nov. 



9 — Sides of the prothorax distinctly sinuate behind the middle and prominent at basal 

 third or fourth, the body, legs and antennae pale piceo-testaceous in color, the 

 head and pronotum darker piceous ; pubescence very short and somewhat abun- 

 dant ; antennae rather slender, the club moderate, sometimes dusky, its first two 

 joints but slightly transverse ; prothorax two-fifths or more wider than long, the 

 sides arcuate and strongly converging at apex and base, the former slightly 

 narrower, the punctures fine but strong and rather close-set ; elytra oblong, two- 

 thirds longer than wide, distinctly wider than the prothorax, narrowing gradu- 

 ally behind the middle ( ^ ), or in apical two-fifths ( 9 )> rather obtusely rounded 

 at apex, the punctures fine but rather close. Length l. 7-1. 85 mm ; width 0.7- 

 0.8 mm. Colorado constricta, sp. nov. 



Sides of the prothorax not or very obsoletely sinuate behind the middle ; the body 

 smaller and black throughout 10 



10 — Antennal club shorter and broader, its first two joints strongly transverse ; legs 

 and antennae rufo-piceous, the club of the latter blackish ; pubescence moderately 

 abundant and short but coarse and distinct ; prothorax less than one-half wider 

 than long, narrowing slightly only very near the base, the sides obviously con- 

 verging, broadly and evenly arcuate thence to the apex ; disk unusually tumid at 

 the middle near the base and just before the impressed margin, the punctures 

 rather fine but deep, close-set and conspicuous ; elytra rather elongate, distinctly 

 wider than the prothorax, parallel anteriorly, gradually narrowed behind the mid- 

 dle, moderately obtuse at tip, the punctures only moderately fine, deep, close-set 

 and distinct. Length 1. 65 mm.; width 0.65 mm. Colorado. 



tenebrosa, sp. nov. 



