AMERICAN COLEOPTERA. 



71 



front, as usual with transverse rows of sharp granules, punctured behind, with 

 a nearly smooth space each side; dorsal line smooth, narrow and slightly ele- 

 vated ; "behind the roughened part is a broad shallow transverse impression; 

 elytra with approximate rows of rather distant punctures, posterior declivity 

 deeply sulcate next the suture, outer edge of declivity with three small denti- 

 cles, between which and the suture are two larger and more prominent acute 

 teeth; front tibiae with 4 — 6 distant acute teeth. Length .08— .12 inch; 



2 — o mm. 



Lake Tahoe, Calaveras and Mojave region, California ; Mr. Crotch : 

 Vancouver Island; Mr. Matthews. This species is allied to C. niti- 

 dulm, but is larger and less elongate. It is easily distinguished 

 by the dorsal line of the prothorax being feebly elevated, and there- 

 fore subcarinate, while in nitidalus and atratitlux the line is broader 

 and flat. The teeth of the posterior declivity of the elytra are more 

 developed and placed in the same manner as in certain species of 

 Xi/lohoruii, but the club of the antennae is not at all as in that genus; 

 the transverse sutures are quite distinct and convex forwards, pre- 

 cisely as in C. nitvhdus. In the black specimens the shank of the 

 antennae and the tarsi are brown. 

 / C. puncUcolliS.— Cylindrical, black or brown; prothorax nearly one- 

 half longer than wide, in front with transverse rows of acute granules, behind 

 sparsely and strongly punctured; elytra with rows of rather close set punc- 

 tures, rows not approximate; posterior declivity deeply and broadly sulcate, 

 outer edge of declivity obtuse; denticles very small, scarcely perceptible. 

 Length .05— .06 inch; 1.2— 1.5 mm. 



Calaveras, California; one specimen, Mr. Crotch; Texas; Mr. Bel- 

 fraf^e. Also allied to 6'. nltldalns, but much smaller, with the elytra! 

 rows of punctures finer and more distant, and the denticles of the pos- 

 terior declivity small and inconspicuous. 



V C. digestus.— Black, shining, thinly clothed with fine erect hair; protho- 

 rax one-third longer than wide, rounded in front, rough with acute tubercles 

 and sparsely pubescent, disc behind strongly not densely punctured, with 

 smooth median spaces, and a vague transverse impression behind the rough 

 portion; elytra with somewhat irregular rows of moderate sized punctures, su- 

 tural grooves extending from the middle to the tip, posterior declivity convex, 

 nearly smooth, with the suture elevated, and the furrow composed only of the 

 sutural stria. Length .70 inch ; 1.7 mm. 



Mojave Desert; Mr. Crotch. Allied to (J. jmberulus Lee, hat 

 with the punctures of the elytra more distinctly arranged in rows ; 

 and the pubescence finer. Rubbed specimens may appear to resem- 

 ble atratulus and nitidalus, bnt the elytral punctures are much smaller, 

 the rows more approximate, and the groove of the posterior declivity 

 much narrower. 



