40 MEMOIRS ON THE COLEOPTERA 



bined. Body rather narrowly oval, very convex, not much nar- 

 rowed posteriorly, the apex broadly parabolic; legs and antennae dark 

 rufous, the latter piceous distally; head three-fifths as wide as the 

 prothorax, very minutely, sparsely punctulate; antennal club long, 

 the eleventh joint about twice as long as wide; prothorax less than 

 half as long as the elytra, which are slightly elongate, having series 

 of transversely lunate but everywhere excessively feeble and shallow 

 punctures, and with very feebly impressed lines in the type, these 

 lines toward apex becoming extremely feebly reticulate; abdomen 

 sparsely and feebly punctulate. Length 1.65 mm.; width 0.9 mm. 

 Texas (the locality unrecorded) obsidianus n. sp. 



Metasternal process similarly long, extending well beyond the coxae, but 

 with its apex evenly and circularly rounded and evenly beaded; 

 third antennal joint fully as long as the next two combined, the 

 eleventh joint not quite so elongate as in the preceding 13 



13 Form oval, moderately narrowed behind, the apex parabolic; under 

 surface black, the legs nearly black, the antennae throughout piceous- 

 brown; head distinctly more than half as wide as the prothorax, very 

 finely and not conspicuously punctate; antennal club very large, 

 rather broad and almost as long as the entire funicle, the eleventh joint 

 with a rather deep entire pseudo-suture well beyond the middle; 

 prothorax large but not quite half as long as the elytra, which are 

 distinctly longer than wide, the impressed lines very fine and barely 

 traceable, the very feeble lunate punctures rather narrow discally 

 but rapidly becoming broad laterally, irregularly crowded near the 

 postero-lateral edges; prosternal process unusually broad posterially, 

 the metasternal broad, the circularly rounded tip evenly and rather 

 finely beaded. Length 1.65-2.3 mm.; width 1.05-1.3 mm. Iowa, 

 Texas (El Paso), Colorado (Golden and Colorado Springs), New 

 Mexico (Jemez Springs) and Utah (St. George). A rather common 

 species, in no example of which is the medio-basal margination of the 

 pronotum invisible, though it is frequently feeble. Kansas LeConte. 



simplex Lee. 



Form more narrowly oval, more strongly and arcuately narrowed behind 

 about the middle, the combined apex rather acutely parabolic in the 

 type; under surface black, the legs and antennae obscure rufous; head 

 about half as wide as the prothorax, very finely punctate; antennae 

 rather long, the funicle longer than the club, which is narrower than 

 in the preceding species; prothorax well developed, scarcely more 

 than twice as wide as long, though distinctly less than half as long as 

 the elytra, the latter much longer than wide, with broad, feebly 

 impressed lines in the type, which however do not become reticulate 

 posteriorly, the very shallow punctures widely lunate and close-set 

 broadly on the flanks posteriorly; metasternal bead fine, the apex 

 broadly rounded. Length 1.55-1.7 mm.; width 0.78-1.0 mm. 

 Colorado (Boulder Co.) subacutus n. sp. 



Form much shorter and relatively broader than in the preceding, oval, 

 the entire elytral outline that of a regular parabola; legs dark rufous; 

 head large, three-fifths as wide as the prothorax, extremely minutely, 

 sparsely punctate, the antennae rather slender, the funicle longer 



