144 Zoological Society, 



margins are nearly straight, excepting near the lateral angles, which 

 are produced. Besides the ordinary rugae on the thorax, there are 

 two large longitudinal and slightly curved ridges, situated one on 

 each side, nearly midway between the mesial line and the outer 

 margin ; and on each elytron is a strongly elevated costa or ridge, 

 extending from the base very nearly to the apex, and running nearly 

 parallel with the lateral keel of the elytron, on the mesial line of 

 which they are placed. The spaces between these costae is some- 

 what concave, and so is the interstice of the costa and the lateral 

 keel of the elytron, which is crenulated or irregularly indented. The 

 mentum is very coarsely punctured, and the punctures are confluent. 

 The under side of the head is punctured, and there are numerous 

 coarse punctures on the prosternum between the legs. The basal 

 segments of the abdomen have small longitudinal sulci beneath. 



Besides the great difference in size and form indicated by the di- 

 mensions, there occurs sometimes a difference in the sculpturing of 

 the thorax and elytra, which I could scarcely have believed to exist 

 in the same species had I not had an opportunity of examining many 

 specimens. In a specimen before me, the rugae on the head, tho- 

 rax and elytra are much less distinct than in the individuals from 

 which the above description is taken ; and this is combined with a 

 convexity of the elytra (which are almost always concave between 

 the two dorsal costae and also between these costae and the lateral 

 keel), giving a very different aspect to the specimen under consi- 

 deration. 



In having the thorax distinctly contracted behind, and in the more 

 truly moniliform structure of the antennae, the present insect ap- 

 proaches more nearly to Callyntra than to Epipedonota, but the ter- 

 minal joint of the antennae is decidedly smaller than the rest. I have 

 before me specimens of the Callyntra multicostata and Call, vicina 

 (which I scarcely think a distinct species), and do not find so marked 

 a difference in the size of the terminal joint of the antennae as com- 

 pared with the penultimate joint, as that represented by M. Solier's 

 figure — indeed the penultimate joint and terminal appear to me to 

 be equal in size, or most nearly so. 



Epipedonota affinis. JEpip. atra, nitida : capite antice punctis spar- 

 sis, et postice rugis transversis undulatis, notato ; thorace latiore 

 quum longo, ad medium depresso, rugis vel plicis fere longitudina- 

 libus, ad latera transversis notato ; elytris thorace latioribus, prope 

 suturamfere lavibus, singulorum dimidio externo sulcis transversis, 

 his costd longitudinali, in duas series divisis ; prosterno sulcis 

 distinctis longitudinalibus ; segmentis abdominalibus leviter longi- 

 tudinali- sulcatis. 

 Long. corp. 9 \ lin. ; lat. 5 J lin. 

 Hab. Petorca? 



This species is of a shorter and broader form than Epip. ebenina, 

 the furrows on the thorax are smaller and more numerous, and the 

 elytra present but one distinct costa besides the lateral keel, the ridge 

 corresponding to that nearest the suture in E. ebenina, being here ob- 

 literated, or very nearly so. 



