1881.] LIZARDS FROM ECUADOR. 233 



form from all the allied ones with which I have the means of com- 

 paring 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 Pantodactylvs, from which it must be separated in conse- 

 quence of this peculiaritj' of the feet, I have formed a new subgenus 

 Frionodactylus for its reception. 



Three rather large specimens from Canelos, and one from Palla- 

 tanga. 



6. Leposoma' carinicaudatum. 



Lepidosoma carinicaudatum, Cope, J.Ac. Phil. viii. 1876, p. 160. 

 Two good-sized specimens of this very striking species from Pal- 

 latanga and two from Cauelos. 



7. Leposoma buckle-xi, sp. u. (Plate XXII. fig. 2.) 



Rostral plate and symphysial plate of lower jaw broad, especially the 

 latter. A single internasal one third broader than long ; two trans- 

 verse 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 intervening 

 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 to- 

 wards 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 })lates, 

 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 postniental re- 

 gion, uniform triangular pointed scales cover the whole of the space 

 as far as the chest, where they form a very indistinct collar not con- 

 tinued 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 witii 

 strongly keeled scales above, like the back, the keels showing a 



' See Prof. Peters's recent rehabilitation of the old Spixian form of this 

 name, ' M.B. Ak. Berl.' 1880, p. 217. 



