[29] 



NORTH AMERICAN COLEOPTERA. 185 



dark fuscous; integuments polished; pubescence rather coarse, very short 

 and rather dense. Head moderate, much wider than long; eyes very large, 

 prominent; base broadly truncate; surface feebly convex, scarcely percepti- 

 bly punctate; occipital foveas rather large, feebly impressed, on a line 

 through the anterior margins of the eyes, mutually two and one-balf times as 

 distant as either from the eye; apical equal in size, feebly impressed; sur- 

 face between the antenna? gradually declivous; antenme somewhat robust, 

 distinctly longer than the head and prothorax together, club rather promi- 

 nent; basal joint feebly dilated, slightly longer than wide, second slightly 

 smaller, longer than wide, subcylindrical, third slightly shorter, slightly 

 obconical, distinctly longer than wide, tenth as long as wide, much wider 

 than the ninth, eleventh distinctly wider than the tenth, slightly elongate, 

 obliquely acuminate. Prothorax widest at two-rifths the length from the 

 apex, where it is scarcely wider than the head, nearly one-third wider than 

 long; sides rather strongly rounded, rather strongly convergent and feebly 

 sinuate to the base; the latter broadly, feebly arcuate, three-fourths as wide 

 as the disk, one-half wider than the apex; the latter transversely truncate; 

 disk strongly convex, scarcely punctate; lateral and medial foveas equal, 

 moderate, the former more broadly impressed. Elytra at base distinctly 

 wider than the prothorax, at apex slightly less than twice as wide as the lat- 

 ter; sides evenly, not very strongly arcuate; disk slightly wider than long, 

 evenly, rather feebly convex, extremely minutely punctate; sutural striae very 

 distinct and deeply impressed, rather approximate, nearly parallel; discal ' 

 deeply impressed and distinct, becoming slightly recurved posteriorly, and 

 terminating abruptly at one-fifth the length from the apex. Abdomen fully 

 as wide as the elytra; border wide and prominent; surface scarcely punctate, 

 moderately convex; basal carina? distant by slightly more than one-third the 

 total width, distinct, less than one-third as long as the segment, almost par- 

 allel. Legs rather long and slender. Length 1.5 mm. 



Texas; (Austin 14). 



This species is remarkable amongst the American repre- 

 sentatives of the genus, in the complete absence of male 

 sexual modifications of the dorsal segments of the abdomen. 

 The male described above is very slightly more robust than 

 the female, and has the antenme slightly longer and with a 

 more prominent club, the tenth joint especially being 

 shorter and more transverse in the female. The type speci- 

 men has the oedeagus protruded. The lateral members are 

 seen to be two thin, elongate laminae, obliquely acuminate 

 at apex and having at the middle of the external edge a 

 small tuft of dilated membranous hair. 



