Platymn.e 119 



the angles notably obtuse though bluntly evident; base arcuate 

 laterally, wider than the deeply sinuate apex; surface with some 

 feeble transverse rugulse, the impressions barely traceable, the 

 margins rather broadly declivo-explanate, not punctate; foveae 

 elongate, moderately impressed, the surface thence laterally with a 

 feeble convexity; elytra barely a third wider than the prothorax, 

 oblong, rapidly obtuse at apex, the sinus long and distinct; striae 

 fine, nearly smooth, not impressed and not much stronger apically, 

 the ninth almost midway between the edge and the eighth; intervals 

 wide, flat, the third with five or six punctures. Length ( 9 ) 8.5 mm. ; 



width 3.5 mm. California (Lake Tahoe) breviusculum n. sp. 



Elytra more elongate, at least one-half longer than wide 14 



14 — Body notably small in size, slender. Rather convex, black, with 

 obscure aeneous lustre dorsally, polished; head scarcely longer than 

 wide, with moderate eyes, four-sevenths as wide as the prothorax; 

 front with two small deep punctiform impressions between the 

 eyes; antennae almost half as long as the body, the third and fourth 

 joints equal; prothorax only about a fourth wider than long, with 

 the sides subevenly and moderately arcuate throughout, though 

 widest slightly before the middle; basal angles broadly rounded 

 and subobliterated; edges finely reflexed, evidently more so about 

 the basal parts; impressions shallow but evident, the stria fine, 

 somewhat impressed; foveae large, elongate and moderately deep, 

 rugulose, traceable well beyond the middle; base barely wider than 

 the moderately sinuate apex; elytra one-half longer than wide, 

 scarcely two-fifths wider than the prothorax, gradually and evenly 

 rounding in about apical third, the sinus distinct; striae moderate, 

 grooved, not quite smooth, only very little stronger at apex; intervals 

 flat throughout the length and width, the third with about five 

 punctures; mesosternum punctured laterally; met-episterna small, 

 one-half longer than wide; anterior male tarsi distinctly dilated. 

 Length (cf) 7.5 mm.; width 2.8 mm. Nevada (Reno). One 



example, taken by the writer pertinax n. sp. 



Body larger, relatively more ventricose except in atromicans 15 



15 — Body subparallel and feebly convex; prothorax swollen at the sides, 

 which become notably oblique and straight in nearly basal half. 

 Deep black and without trace of metallic lustre, the upper surface 

 rather fiat; head triangular, with somewhat large and prominent 

 eyes, three-fifths as wide as the prothorax, the interocular foveiform 

 impressions very small and feeble; .antennae nearly half as long as 

 the body, the third and fourth joints equal; prothorax a third 

 wider than long, widest and with well rounded sides near apical 

 two-fifths; basal angles broadly rounded; side margins somewhat 

 broadly reflexed throughout and obsoletely punctate; transverse 

 impressions obsolescent; foveae oval, rather deep, rugulose, not 

 anteriorly prolonged, the surface thence toward the sides very 

 distinctly and longitudinally swollen; elytra three-fifths longer than 

 wide, between a third and two-fifths wider than the prothorax, 

 rather rapidly obtuse at apex, with long and distinct sinus, the 

 sides posteriorly rather widely declivo-deplanate and less shining; 



