Coleopterological Notices, VI. 535 



tate, the impressions feeble; epistoma rather lono;, truncate, emarginate at the 

 sides tOAvard base as in serricollis; labruiu about as long as wide, strongly 

 rounded; ej'es large and somewhat prominent; antennae verj' much shorter 

 than the prothorax, rather slender but rapidly and very strongly incrassate and 

 compressed toward apex, the last three joints very wide and asymmetric, the 

 eleventh as wide as long, tenth very strongly transverse. Prothorax fully as 

 long as wide, the sides parallel and jiist visibly arcuate, gTadually and broadly 

 arcuate and convergent at apex, the angles completely obliterated, the true 

 apical margin not one-half as wide as the base, the latter broadly arcuato- 

 truncate; basal angles obtuse and rather blunt but easily distinguishable; disk 

 rather finely and sparsely punctate, the lateral edges stronglj' serrate especially 

 toward apex. Elytra three-fifths longer than wide, slightly wider than the 

 prothorax and distinctly less than twice as long, parallel and straight at the 

 sides, not broadly rounded at apex, not very coarsely but strongly and some- 

 what densely punctured. Under surface moderately densely clothed with 

 similar cinereous pubescence. Leng-th 2.8-3.8 mm. ; width 0.95-1.5 mm. 



Arizona. 



In the above described male the corneous copulatory sheath 

 is large and C3lindrical, with the lower surface produced in a fine 

 slender point, the upper or posterior surface coriaceous and con- 

 cave, the efferent duct projecting between two wing-like plates 

 which partially close the orifice. The prothorax of the male is 

 more elongate than in an}' other das3'tide form known to me, ex- 

 cept Mecomycte?' omalinus. 



In the female the form is quite diflferent, the prothorax being 

 much smaller, nearh' one-fourth wider than long and narrowed 

 from base to apex, broadly rounded and scarcel}' at all serrate 

 at the sides, the elj'tra longer though similar in shape, one-half 

 wider than the prothorax and two and one-half times as long. 

 Numerous specimens are before me. 



3. C. serrulatus Lee— Proc. Acad. Nat. Sci., Phila., 1866, p. 356 (Pris- 

 toscelis). 



Oblong, stout, convex, black, moderately' shining ; legs black, 

 the tibiae and tarsi rufo-piceous ; antennae black, the funicle tes- 

 taceous toward base, the two basal joints black; pubescence very 

 short, coarse, rather sparse, cinereous and intermixed with num- 

 erous long coarse and erect black hairs ; marginal cilia of the 

 prothorax very long black and bristling, of the elytra much 

 shorter and nearly cinereous. Head two-thirds as wide as the 

 prothorax, strongly and sparsely punctate ; epistoma long and 

 rather narrow, smooth ; labrum long, strongly rounded ; eyes 



