36 MEMOIRS ON THE COLEOPTERA 



the mesosternal and epipleural structure, as well as the deeply 

 sulcate elytra. 



Exoma Csy. 



The body is very small in size, strongly convex, of a generally 

 oblong-oval form, more acute behind. The head has the clypeal 

 suture wholly obsolete, the anterior margin evenly arcuate, with 

 the edge thin and slightly reflexed, the antennae nearly as in Curi- 

 mopsis, the 3-jointed club being gradually broader from its base; 

 the mesosternal pit occupies the entire intercoxal portion of the 

 mesosternum; the abdomen is relatively rather small, w r ith distinct, 

 equal and perfectly transverse sutures. The epipleura are broad 

 anteriorly and but slightly hollowed at base for the retracted legs; 

 at the posterior limit of the metasternum they terminate abruptly, 

 the marginal line extending obliquely upward as seen by lateral 

 view as well as outward and thence posteriorly wanting, being 

 coincident with the lower elytral edge. This structure of the 

 epipleura, the broad anterior part ending abruptly behind in a 

 truncature, recalls that of Trinaria as described before, but in that 

 genus the edge of the elytra posterior thereto is in the same line as 

 the anterior outer edge and is not superior to it in plane as it is in 

 ILxoma. The legs are retractile but not so strongly as in the pre- 

 ceding tribe, resembling more nearly the Simplocariini in this 

 respect. The scutellum is notably small and rather convex and the 

 deep, equal and entire elytral sulci have no tendency to join the 

 sutural before the apex as they do in Simplocaria and Curimopsis. 

 The single species is the following: 



Moderately stout, very convex, strongly shining throughout, black, the 

 prothorax slightly, the legs pale, testaceous; head smooth, finely, 

 sparsely punctate, the sparse setae short, recurved and squamiform; 

 prothorax twice as wide as long, the strongly converging sides sen- 

 sibly arcuate from above; surface smooth and polished, with remote 

 and minute subasperate punctules, each bearing a rather short coarse 

 and stout recurved seta; scutellum very small, much longer than 

 wide, very acute, convex and nude; elytra barely as long as wide, 

 as wide as the prothorax, widest, somewhat inflated and with 

 rounded sides near basal third, thence rapidly narrowed and with 

 more feebly arcuate sides to the rather acutely rounded apex, very 

 steeply declivous posteriorly; sulci very coarse and deep, the inter- 

 vals convex, smooth and polished, each bearing a single series of 

 short stiff palish hairs, which are coarse and so strongly curved that 

 their tips are nearly bent back upon the surface, forming a semi- 



