Mr. A. W. E. O'Shaughnessy on new Lizards. 295 XXXIII. — Descriptions of new Species of Lizards in the Col-lection of the British Museum. By A. W. E. O'Shaugh-nessy, Assistant in the Natural History Departments. The present paper contains descriptions of four new species of Cercosauridae, one of them being the type, apparently, of a new genus. I have also taken this opportunity to publish descriptions of some new species of lizards belonging to the genera Gongylus, Mocoa, and Leiocephalus. Neusticurus ecpleopus. Cope. Neusticurus ecpleopus, Cope, Journ. Ac. Nat. Sc. Philadelphia (n. s.) viii. 1876, p. 161. In the course of recent examinations of lizards in the British-Museum collection I have been able to recognize and separate this species from N. {Casta) bicarinatus, L., having previously labelled it as a new species before seeing Prof. Cope's description. M. F. Bocourt informs me, in reply to a commu-nication which I addressed to him on the subject, that he has found two very small specimens in the Paris Museum, col-lected by MM. Castelnau and Deville (Cat. Method. 1851, p. 112), exhibiting all the characters by which this species is distinguished from the larger one. In the British-Museum collection it is represented by three full-grown examples and one young, while of the N. bicarinatus we possess two adults and one young individual. From this series I am enabled to state that the internasal plate is not always entire in AT". ecpleopus, two of the specimens showing it cleft longitudinally as in N. bicarinatus. The other points of difference, how-ever, are very well marked. The carina? of the dorsal scales are much stronger and more prominent ; the scales on .the nape are granular, with rows of convex ones, much as in Lepidophyma ; moreover the ventral plates are quadrangular and in six longitudinal series, whereas in N. bicarinatus they are always rounded and in eight or ten series. I may further add that in N. bicarinatus there is a small quadrangular pre-frontal plate wedged in between the internasal and the two large fronto-nasals ; in N. ecpleopus this extra plate is absent, even when the internasal is bisected. Emphrassotis, gen. nov. (Cercosaurid.). Head broad, somewhat flattened above; snout short, rounded. Ear indistinct. Nostril in a single large nasal plate ; no frenal ; no supranasals ; no fronto-parictals ; no fronto-nasals.
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