246 M. G. A. BOtJLENGER ON A NEW ENYALIUS. [Feb. 1, 



5. Description of a new Species oiEny alius in the Brussels 

 Museum. By G. A. Boulenger. 



[Keceived January 19, 1881.] 

 (Plate XXVI.) 



In a paper on the collection of Reptiles made in Ecuador, and 

 presented to the Brussels Museum by Consul Emile de A'^ille, I have 

 mentioned ^ a specimen of Enyalius, which I identified with E. 

 heterolepis, Bocouit, noticing, however, that the dorsal crest was 

 more elevated in my specimen than in the typical one. Having 

 reexamined the former, and compared it with examples of the two 

 beautiful species just described by Mr. O'Shaughnessy, viz. E. micro- 

 lepis and E. pi-cestabilis, I am now convinced that it belongs to a 

 distinct, hitherto undescribed species, which I have the pleasure of 

 naming 



Enyalius oshaughnessyi, sp. u. (Plate XXVI.) 



Head broad and rounded, once and two thirds as long as broad, 

 covered with subquadrangular strongly keeled scales, those on the 

 canthus rostralis and the superciliary border a good deal larger and 

 projecting. A small but distinct occipital plate. Loreal region 

 concave, with small, irregular, keeled scales. Temporal region with 

 small convex scales, above with a series of large conical ones ; a few 

 large conical scales near the tympanum. Labial shields 14, equal. 

 Scales of the back and sides of the body small, smooth and slightly 

 keeled, irregularly intermixed with larger but not conical ones. A 

 median dorsal crest of very large conical scales, beginning behind 

 the occiput, and gradually diminishing in height to the base of the 

 tail, where it becomes double and soon vanishes ; the highest of 

 these scales on the neck measure more than the vertical diameter 

 of the ear-opening. A single lateral series of conical scales on each 

 side of the back, beginning at a small distance behind the ear, and 

 extending to the sacral region. There are about 12 longitudinal 

 rows of scales between the dorsal crest and the lateral series, and 30 

 between the latter and the belly. Scales on the limbs strongly 

 keeled. Scales of gular region keeled ; those of the pectoral and 

 ventral regions as large as those upon the limbs, and strongly 

 keeled. A single femoral pore on each side. Tail compressed, 

 with verticillate, strongly keeled scales, the verticilli composed of 

 five or six rings of increasing size ; scales of the lower surface equal 

 and also strongly keeled. 



Coloration (in the single male specimen). General colour dark 

 brown ; throat and some of the scales of the sides of the body 

 and tail and some of the limbs greenish ; a light rounded spot on 

 each side of the neck, behiad the ear ; gular fold black. 



' Bull. Soc. Zool France, 1880, p. 43. 



