1 8 MEMOIRS ON THE COLEOPTERA 



Omus temperatus ssp. sparsellus nov. Body elongate and rather less 

 convex, opaculate, the elytra rather dull; head much narrower than the 

 prothorax, with very obsolete rugulosity and with very faint minute 

 sparse frontal punctures at the middle; labral lobe narrower, prominent, 

 truncate at the middle; eyes moderately convex; antennae not very long 

 or slender; prothorax obtrapezoidal, the sides more oblique than in 

 mariposac, parallel in less than apical third, fully a fifth wider than long, 

 the side margins attaining the base; surface smooth, the fine incised lines 

 barely traceable on the disk; elytra evenly oblong-oval, widest at the 

 middle, with evenly and moderately arcuate sides, rather obtuse apically; 

 side margins sharply reflexed, especially near the humeri, which are 

 narrowly distinct at base; disk two-thirds longer than wide, the punctures 

 large but very shallow, well separated, the acute granules very con- 

 spicuous; the punctures become coarse, deep and contiguous postero- 

 laterad; anterior tarsi (cf) only very moderately dilated, the second 

 joint markedly wider than the third, which is quadrate. Female un- 

 known. Length 15.5 mm.; width 5.7 mm. California (Wawona, 

 Mariposa Co.). 



Evidently different from either of the two preceding or temperatus 

 because of the elytral punctures and general form; in outline it is 

 nearly as in difficilis; the prothorax is more nearly as in sequoiarum 

 than horni. 



The following is a remarkably isolated species belonging to the 

 horni group in the vicinity of temperatus: 



Omus subsericeus n. sp. Elongate, convex, only moderately ventricose, 

 alutaceous, the elytra slightly more shining than the anterior parts, the 

 micro-reticulation very distinct; head nearly smooth, the impressions 

 large but shallow, the median part of the front only sparsely and infinites- 

 imally punctulate; labrum with the lobe broad, evenly arcuate and 

 much produced beyond the sides; antennae short, not stout; prothorax a 

 fourth wider than long, widest near the apex, the sides very moderately 

 converging and feebly arcuate thence posteriorly, more oblique and 

 straight near the base; side margins very finely reflexed, more so basally, 

 attaining the base, the basal groove coarse, interrupted medially, the 

 median lobe strong; surface feebly convex, very smooth, with longitudi- 

 nal wrinkles anteriorly and slightly rugulose basally, the transverse 

 impressions feeble and extremely indefinite, the median stria fine but 

 distinct, attaining the base; elytra three-fourths longer than wide, nearly 

 a third wider than the prothorax, gradually obtusely ogival in about 

 apical half, the humeri distinct but broadly rounded; punctures small, 

 feeble and remote, stronger, deeper and somewhat confluent laterally, 

 the foveae few, rather large and distinct; every puncture has a distinct 

 asperity. Length 16.0 mm.; width 5.8 mm. California (Kaweah), 

 Hopping. 



Differs from temperatus in its more cylindric form, feebler and 

 sparser elytral sculpture and in the resulting peculiarities of habitus, 

 among other characters. 



