422 MEMOIRS ON THE COLEOPTERA 



true, but unmistakably different; they are, so far as represented in 

 my collection, as follows: 



Head and pronotum strongly alutaceous or opaculate 2 



Head and pronotum strongly shining, not alutaceous, except toward the 

 sides of the pronotum 3 



2 Head strongly triangular, large, the diverging sides posteriorly nearly 

 straight fora long distance. Male with the head very nearly as wide 

 as the elytra, the surface punctulate; the foveae are one near the eye 

 and one obliquely remote from the eye posteriorly, the sides with 

 rather strong scattered punctures; antennae strongly fusiform, very 

 thick medially; eyes oblique, feebly convex, subtruncate in front, at 

 fully three times their length from the constriction; prothorax 

 parallel at the sides and fully one-half wider than long, the surface 

 declivously subexplanate at the sides, the tripunctate series distinct; 

 scutellum with fine punctures and coarse black hairs; elytra quad- 

 rate, parallel, narrower than the prothorax, finely, very densely 

 punctate and nigropubescent; abdomen four-fifths as wide as the 

 elytra, nearly similar in sculpture and vestiture, the three or four 

 basal tergites distinctly impressed basally, the sixth ventral with the 

 small medial sinus about three times as wide as deep; anterior tarsi 

 very broadly dilated basally, the posterior strongly tapering, thick 

 basally; all the tarsi very hairy. Female smaller and less stout 

 than the male, the head three-fourths as wide as the elytra, the eyes 

 less oblique, at more than twice their length from the constriction; 

 prothorax also smaller, less transverse, more anteriorly narrowed, the 

 sides arcuate; elytra less conspicuously narrower than the prothorax; 

 abdomen correspondingly narrower than the elytra; anterior tarsi 

 strongly dilated. Length (cf) 19.0, (9) 14.5-15.0 mm.; width (cf) 

 4-3i ( 9 ) 3-4~3-6 mm. California (probably northern) . .laxatus n. sp. 



Head much less triangular, evidently shorter than wide, smaller in both 

 sexes than in the preceding. Male moderately large, stout, rather 

 convex, similar in color, lustre and sculpture to the preceding, but 

 the tempora are much less diverging and are arcuate to the posterior 

 inward curvature; eyes relatively larger, rather less oblique and at 

 somewhat more than twice their own length from the constriction; 

 fovese: one near the upper margin of the eyes and one, discal, between 

 the eyes and the base, with numerous small punctures on the 

 flanks, the general surface similarly punctulate; prothorax one-half 

 wider than long, the sides feebly converging anteriorly, arcuate, the 

 base rounded; punctures as in explanatus; elytra and abdomen also 

 nearly as in that species; sixth ventral with a nearly similar but 

 shallower sinus, the tarsi nearly similar. Female smaller and nar- 

 rower than the male, with still smaller though otherwise subsimilar 

 head, the eyes at scarcely twice their length from the base; neck 

 behind the constriction polished, as usual in the genus; prothorax 

 smaller, two-fifths wider than long, more rounded at the sides, the 

 elytra and abdomen as usual. Length (cf) 13.5-15.0, (9) H-7 

 -13.5 mm.; width (c?) 3.5-3.6, (9 ) 3.0-3.2 mm. California (Santa 

 Clara to Sonoma Cos., and on Mt. Diablo; also at or near Colton 



