278 TMay, 



crown behind is flat, or rather depressed, and is simply dilated and pro- 

 longed into an acute angle on each side ; but in O. corctdum, each side 

 forms a very broad elevated rim, rounded behind, separated from the 

 crown by a deep groove, and overhanging the eye. The head is consider- 

 ably wider than the broadest part of the thorax, glossy-black, with the 

 labrum pitchy-red, and palpi reddish-testaceous ; it is separated from 

 the neck by an impressed line : the antennae have the four basal joints 

 testaceous (the basal joint darker in front), and the apical joints 

 blackish. The thorax is constricted before and behind, with the 

 anterior rather wider than the posterior part, and the central portion 

 oval, convex. The elytra have distinctly squared shoulders, and are as 

 broad in this part as posteriorly ; the surface is equally convex, and the 

 sides are rather abruptly narrowed a little before the apex ; the latter 

 is deeply emarginate-truncate, with both angles acute and moderately 

 produced, the external one longer than the sutural ; the whole surface 

 is punctured, but much more strongly so towards the base, where the 

 large impressions tend to form rugae ; the central band is narrow, and 

 lies across the elytron, nearly touching both suture and margin ; it is 

 partially punctured, and of a tawny hue : the apex is broadly pale, the 

 colour advancing along the suture nearly to the middle, and becoming 

 more rufous. The under-surface is reddish, the abdomen darker. The 

 legs have very few and long bristles. 

 Bahia ; discovered by Mr. Eeade. 



Ctenostoma asperulum. — Long. 3f lin. ; lat. elytr. flin. $ . Elon- 

 gate, dilated behind ; bronzed-piceous, shining : elytra very narrow 

 at the base, dilated beyond the middle, but not gibbous ; surface 

 very coarsely punctured, with the interstices towards the base raised 

 in numerous conical tubercles, the middle crossed by a straight pale 

 testaceous fascia, and the posterior part of the suture and apex 

 broadly pale-testaceous ; each elytron sinuate-truncate, with both 

 angles prolonged into spines : posterior angles of the crown 

 slightly dilated behind the eyes. 



A small species, very similar in shape and colours to C. pygmceicm, 

 but differing in the tuberculated surface of the elytra and their bispinose 

 apices. The dilatation of the head behind the eyes is obtuse, and of 

 small dimensions ; it is separated from the neck by a depression. The 

 thorax is distinctly broader before than behind, and the intermediate 

 portion is oval and very convex. The elytra are of a pitchy-bronze 

 hue, clothed with a few long black hairs ; the sutural spine is rather 

 longer than the external one. The legs are pitchy-red, rather darker 



