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Show 244 MR. A. W. E. O'SHAUGHNESSY ON [Feb. 1, species is unrepresented in the British Museum, as Bibron's supposition of its identity with L. carinatus appears to have been incorrect, although very confidently expressed. The description indicates, however, a cephalic scutellation totally different from the present species, a very much higher crest, and other conspicuous points of difference. The scales on the top of the muzzle in the present species are quite large, only about 10 in number, and not keeled, instead of the 30 very small keeled ones mentioned by Bibron. 23. LEIOCEPHALUS TRACHYCEPHALUS. Leiocephalus trachycephalus, Dum. Cat. Meth. Rept.1851, p. Arch. Mus. viii. p. 539, pi. 23. fig. 1. One specimen from Sarayacu, Ecuador. There are now numerous specimens in the British Museum which I have recognized as of this species ; the figure of the entire lizard, however, evidently a very bad one, shows little resemblance to them. 24. HOPLOCERCUS ANNULARIS, sp. n. (Plate XXV. fig. 2.) Scales on snout convex, granular, similar and nearly uniform on the other parts of the head, excepting the supraorbital spaces, where they are larger and rounded or polygonal. The upper surface of the body is covered with a groundwork of small granular scales, with tubercles in several complete longitudinal rows from the nape to the root of the tail, more closely set along the median line of the back ; series of tubercles also descend vertically on the sides. Scales of the belly rather small, but regularly tessellated. Supralabials nine. Infralabials ten. Limbs strongly tubercular. Tail longer than head and body, cylindrical, and surrounded at regular and rather close intervals throughout its entire length by complete rings of projecting tubercles or spinous scales. A series of two or three very large femoral pores on each thigh. Teeth trilobate. Brown, with transverse dark bars on the back. An oblique yellow black-bordered stripe in front of the fore limb. A large yellow spot. on the upperside of the thigh. millim. Total length 132 Length of head to ear-opening 16 Distance from tip of snout to fore limb 27 „ » „ vent 59 Length of fore limb 24 ,, third and fourth fingers 8 „ hind limb '.,, 40 „ fourth toe 14 A single specimen, evidently young, as shown by an external groove indicating imperfect symphysis of the lower jaw, was obtained from Canelos. It is a very interesting form, which, on account of the total dissimilarity of its tail, might have been separated generically from Hoplocercus spinosus. I can, however, detect no other grounds for such separation ; and as I have lately found a |