H. C. FALL. 135 



thorax wider and more rounded at sides, the elytra inflated 

 posteriorly, the antennae barely as long as the thorax, the 

 fourth joint just visibly longer than the third ; the prothorax 

 and lower surface paler than in the male, the elytral striae 

 very fine and not impressed on the disk basally. 



This species seems nearest insidiosa, from which it differs 

 by the less elongate prothorax and shorter antennae. In 

 insidiosa ( c? 1 ) the fourth antennal joint is nearly twice as long 

 as the third and equal in length to the second and third 

 together. Sagitticol/is is also similar in general form and 

 facies, but is a larger species, and in the male the second 

 and third joints of the antennae are short, together not longer 

 than the fourth. 



C. nigricans n. sp. 



Moderately elongate, shining black, the elytra piceous black, legs 

 and antennas rufopiceous, pubescence very fine dark and inconspicu- 

 ous. Antennas short and stout, not reaching the base of the pro- 

 thorax ; second joint a little more than half as long as the third, third 

 and fourth subequal in length, the latter a trifle wider and not quite 

 twice as long as wide ; fifth distinctly shorter than the fourth, the fol- 

 lowing joints gradually shorter, the tenth nearly as wide as long. 

 Front flattened, the impression distinctly triangular in one specimen, 

 punctuation moderate. Prothorax subquadrate, as wide at middle as 

 the apices of the hind angles, sides broadly arcuate, not very strongly 

 narrowed in front, sinuate behind, hind angles moderately divergent 

 and acute, strongly carinate ; punctuation rather dense but not coarse, 

 not closer at sides, median line impressed throughout. Elytra very 

 little wider than the prothorax, striae finely punctate, intervals very 

 finely irregularly not densely punctate, there being four to five punc- 

 tures in the width of the interval. Beneath sparsely finely punctate, 

 the propleurae a little more closely and coarsely. Length, 11.5-12 

 mm. ; width, 3.4-3.5 mm. 



California, Lake Tahoe (type) and Siskiyou County. 



The antennal structure and to a considerable extent the 

 general form is suggestive of sulcico//is, near which the 

 species may be placed. In sidcicollis the prothorax is longer 

 and widest at a point much farther forward. 



C. exclamationis n. sp. 



Obovate, depressed, shining, finely pubescent, black, elytra yellow, 

 each with a small subbasal spot, and behind this an obliquely arcuate 



TRANS. AM. ENT. SOC, XXXVI. JUNE, 1910. 



