50 Memoirs on the Coleoptera 



at the apex throughout; elytra shorter and broader, less than one- 

 half longer than wide, four-fifths wider than the prothorax; apex 

 more rapidly obtuse, the sinus less oblique but more distinct than 

 in the preceding; striae fine, sharp, shallow, the micro-punctulation 

 less distinct; intervals flat, opaculate; tarsi nearly similar. Length 

 (9) 8.5 mm.; width 3.65 mm. California (Sta. Rosa). 



opacellus n. sp. 



7 — Basal thoracic angles not sharply defined, very obtuse, with the tips 

 blunt. Body rather stout, somewhat convex, highly polished above 

 in both sexes, deep black, the anterior parts with evident though 

 rather obscure aeneous lustre, the legs black; head evidently elongate, 

 fully two-thirds as wide as the prothorax, the eyes well developed, 

 moderately prominent; antennae black throughout, somewhat over 

 half as long as the body, the third and fourth joints equal, each 

 longer than the succeeding joints; prothorax short, fully two-fifths 

 wider than long, widest before the middle, the sides moderately 

 rounded and narrowly but strongly reflexed, moderately oblique 

 and straight posteriorly, a little more reflexed at the angles; im- 

 pressions feeble but traceable; foveae deeply concave and slightly 

 rugulose, the base obliquely rounded at the sides, somewhat wider 

 than the deeply sinuate apex, the apical angles well defined; elytra 

 oblong, not quite one-half longer than wide, fully one-half wider 

 than the prothorax, obtusely rounded at apex, the sinus evident; 

 striae moderately fine, obscurely micro-punctulate, feebly impressed; 

 intervals slightly convex, the three dorsal punctures rather small, 

 the first at the third, the two posterior at the second, stria; tarsi 

 very slender, black. Length (9 ) 7-7 mm.; width 2.9 mm. Oregon 

 (Dilley), — Leng quadratus Lee. 



Basal thoracic angles sharply defined, right to somewhat prominent or 

 very moderately obtuse 8 



8 — Form rather stout, moderately convex, very small in size, polished 

 throughout in both sexes, deep black; head slightly elongate, about 

 three-fourths as wide as the prothorax, the eyes rather large, promi- 

 nent; anterior impressions deep, parallel, subarcuate; palpi slender, 

 not evidently pale at tip; antennae black, more than half as long as 

 the body, the third joint distinctly longer than the fourth; pro- 

 thorax short, two-fifths wider than long, inflated and with evenly 

 rounded sides, which become sinuate basally and then sometimes 

 parallel, the margins finely reflexed, rather widely along the basal 

 parts, forming the outer wall of the deep and slightly rugose foveae, 

 .which can be traced scarcely to the middle; surface polished, the 

 rugulae and anterior impression feeble, the stria fine but rather 

 deep, subentire; elytra oblong, two-fifths longer than wide, not 

 quite twice as wide as the prothorax, with nearly straight sides and 

 very rapidly rounded humeri; apex obtuse, the sinus distinct; striae 

 extremely fine and shallow, obsoletely micro-punctulate; intervals 

 flat, the three punctures small; tarsi with the upper surface scarcely 

 modified, the anterior distinctly dilated in the male; met-episterna 

 moderately elongate. Length (cf 9) 6.3-7.4 mm-; width 2.6-3.0 



