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Show 1881.] LIZARDS FROM ECUADOR. 233 form from all the allied ones with which I have the means of comparing it. As in all other respects it is a Cercosaura, and would, on account of its narrow elongate keeled dorsal scales, belong to the subgenus Pantodactylus, from which it must be separated in consequence of this peculiarity of the feet, I have formed a new subgenus Prionodactylus for its reception. Three rather large specimens from Canelos, and one from Pallatanga. 6. LEPOSOMA1 CARINICAUDATUM. Lepidosoma carinicaudatum, Cope, J. Ac. Phil. viii. 1876, p. 160. Two good-sized specimens of this very striking species from Pallatanga and two from Canelos. 7. LEPOSOMA BUCKLEYI, sp. n. (Plate XXII. fig. 2.) Bostral plate and symphysial plate of lower jaw broad, especially the latter. A single internasal one third broader than long ; two transverse fronto-nasals with their points in contact; frontal moderate-sized, triangular in front, truncated behind, longer than broad ; two fronto-parietals ; the interparietal and two parietals are three longish straight plates, nearly equal and uniform, evenly truncated behind at the limit of the occipital region, and without any intervenin°- occipital plates. These three plates have their edges raised, forming longitudinal ridges on the hinder portion of the head ; and the tendency to rugosity extends also to the fronto-parietals. Four supraorbitals. Two narrow oblique frenals. Five supralabials ; one, extremely long, beneath the anterior part of the eye. Four infra-labials. A single mental, followed by three pairs of large plates, those of the first two pairs in contact, the third being separated by smaller irregular-shaped plates, which go semicircularly round towards the angle of the mouth. Temporal scales convex. Ear-opening large, rounded in front, truncate behind. Sides of neck to shoulder also covered with round convex scales. The whole upper surface from the parietal plates, and the sides of the body between the fore and hind limbs as far as the abdomen, covered with elongate lanceolate keeled scales, the points projecting. From the regular plates of the postmental region, uniform triangular pointed scales cover the whole of the space as far as the chest, where they form a very indistinct collar not continued into any transverse fold on the side of the neck. Scales on the chest and anterior part of ventral surface also pointed like those of the throat; middle and posterior abdominal scales square, in eight longitudinal series. Two small anterior and two large posterior prseanal scutes, some smaller ones at the sides. Upper surface of limbs with keeled scales. Toes of fore limb very short, the inner one minute, the third a little shorter than the fourth. Tail with strongly keeled scales above, like the back, the keels showing a 1 See Prof. Peters's recent rehabilitation of the old Spixian form of this name, ' M.B. Ak. Berl.' 1880, p. 217. |