118 AMERICAN COLEOPTERA. 



Hijid angles of thorax with a very fine, short carina. 

 Black, scarcely seneous; elytra finely alutaceous, very finely almost obsoletely 

 striate, the strise finely puncfate ; legs dark piceous or black. Length 



.12. 13 inch prtecinctum Lee. 



Black, more or less seneous; elytra not alutaceous, usually with a subhumeral 

 pale spot, finely striato-punctate ; legs piceous or black, the tibiae and 



tarsi often paler. Length .11-.15 inch dubitaus Lee. 



Hind angles of thorax not carinate. 

 Form moderately elongate. 

 Moderately convex, slender; color black, slightly aeneous, elytra with a sub- 

 humeral pale spot; thorax less than one-half wider than long; legs 

 piceous or nearly black, the tibise and tarsi usually paler. Length 



.12-.14 inch lliutatuiu G. and H. 



Moderately convex ; color brownish aeneous, the elytra with a subhumeral 

 spot and usually a small submarginal one, behind the middle, yellowish 

 testaceous; thorax scarcely wider than long; legs yellowish testaceous. 



Length .12-.14 inch pedicellatuiii Lee. 



Slightly depressed ; color varying from brownish to nearly black, slightly 

 aeneous, elytra with a large subhumeral spot and a smaller one, behind 

 the middle, yellowish testaceous; thorax rather more than one-half 

 wider than long; legs yellowish testaceous. Length .11.-.15 inch. 



quadriniaculatiim Liun. 



Broad, moderately robust ; head and thorax nearly black, tinged with bluish 



green, elytra with a broad pale vitta, with irregular sides, between the 



third and seventh striae, extending from base to apex ; thorax nearly 



twice as wide as long; legs testaceous. Length .14 inch. 



jucunduni Horn. 

 104. B. prteciiictum Lee. — Form slightly elongate, feebly convex; color 

 black, scarcely aeneous, shining. Head large, slightly wider tliau the thorax at 

 apex ; palpi piceous or nearly black; antenna about one-half the length of the 

 body, black, the basal joints slightly rufous beneath. Prothorax subcordate, 

 rather more than one-half wider than long, distinctly narrower at base than apex, 

 sparsely punctate at apex; apex truncate; median line very fine, abbreviated 

 before and behind ; transverse impressions moderately distinct ; basal impressions 

 small, unistriate ; sides strongly arcuate, sinuate in front of the hind angles, 

 which are small, subrectangular, with a very short, fine carina. Elytra wider 

 than the thorax, oblong-ovate, finely alutaceous, very finely or nearly obsoletely 

 striate; striae finely puuctulate; intervals flat, the third with the dorsal punc- 

 tures very small, the first about one-third f)'om base, the second about one-third 

 from apex. Beneath black, shining. Legs dark piceous or black. Length .12- 

 .13 inch ; 3-3.25 mm. 



It approaches most nearly to dubitans, but is distinct by the finely 

 alutaceous elytra, the strise of which are very fine or nearly obsolete 

 and finely punctulate. There is no trace of the subhumeral pale 

 spot, which is usually present in the latter species, in any specimens 

 that I have seen. 



It is known to me from several localities in the more mountainous 

 parts of Colorado, and from Elko, Nevada (Wickhamj. 



