142 NORTH AMERICAN 



the middle teeth are rather less slender and project further beyond 

 the lateral ones than in that species. At first glance this species, 

 es| ecially it" represented by a single specimen, would be pronounced 

 witiiout doubt a pale specimen of ventricvlus^ but when examined 

 carefully it presents so many points of departure from that species 

 irrespective of color, as to leave no doubt whatever of its distinctness. 

 The principal differences are in the color, structure of the antennae, 

 elytral sculpture, abdominal imbrication and slight differences in the 

 sexual characters. In ventricuhis the color is invariably intense 

 black througliout, the fourth joint of the antennae is fully as long if 

 not longer than wide, and the outer joints are more transverse in 

 j)roportion; the elytral sculpture is smoother, although more strongly 

 punctate, and the imbrication of the abdomen is much more irregular. 

 This species is evidently not tiie form alluded to by Dr. Horn, and 

 represented by the paler specimens of ventriculus, the paleness being 

 apparently due to immaturity ; the black abdominal setae and dark 

 piceous color of the head alone refute this view, there being not a 

 particle of variation in the four specimens before me. 



COIVIIRUS Steph. 



C. versicolor n. sp. — Form rather robust, very convex. Pubescence 

 ratber coaise and sparse, yellowish-cinereous ; head and prothorax dark 

 reddish-brown, base of the latter paler ; elytra at base reddish-testaceous, 

 the color extending slightly along the elytra, remainder of tlie disk piceous- 

 black ; abdomen very dark piceous-brown ; under surface of the body very 

 pale reddish-testaceous, abdomen dark brown ; first three joints of antennae 

 pale testaceous, four to ten dark brown, eleventh reddish-testaceous. Head 

 nearly twice as wide as long, moderately convex, highly polished, broadly 

 rounded behind, strongly deflexed ; emargination of pronotum for its recep- 

 tion much more than twice as wide as long, broadly rounded at bottom, sides 

 near the apical angles parallel ; epistoma very slightly wider than long, 

 tinely rugulose, finely and sparsely punctate, sides nearly parallel and 

 straight, apical margin broadly arcuate ; antennae nearly as long as the head 

 and prothorax together, extremely strongly compressed toward tip, the last 

 joint being very thin, second joint much shorter than the third, third to fifth 

 equal in length, the first two equal, thinnest, cylindrical, the fifth bro.ader 

 toward tip, joints six to ten shorter, sub-equal in length, increasing in width, 

 slightly narrowed toward base, sides straight, the former nearly twice as long 

 as wide, the latter slightly shorter than the tenth and but very slightly 

 longer than wide, eleventh elongate, oval, obtusely rounded at tip, much 

 shorter than the two preceding together. Prothorax widest at the base 

 where it is a little more than one-third wider than long; sides very evenly 

 and moderately rounded ; apex much less than one-half as long as the base, 

 very feeldy arcuate, the latter straight ; basal angles from above slightly 

 acute and not at all rounded, laterally slightly produced, rather strongly 



