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Show 234 MR. A. W . E. o'SHAUGHNESSY O N [Feb. 1, tendency to form ridges; those on the lower surface of the tail are also keeled. Femoral pores fourteen. millim. Total length < US Distance from tip of snout to ear-opening.. 12 „ „ „ fore limb .. 21 vent 50 Length of fore limb 15 ,, fourth front toe 4 „ hind limb 23 ,, third hind toe 6 „ fourth hind toe 7 Upper surface pale brown, with a longitudinal row of black spots in middle of back. A light lateral stripe from the supraorbital angle, along the parietal border and extreme edge of the dorsal surface, to the tail. Sides of body black, variegated with blue or yellowish spots on the neck. Entire mental region yellowish, without spots. A dark coloration predominates over the whole inferior surface of the throat (beginning from the last postmentals), of the body, limbs, and tail. The scales are blackish at their root or for half their length, and yellowish at the tips. A single specimen from Canelos. This is a third species of the genus Leposoma, bearing a resemblance to L. carinicaudatum, Cope, in the pointed and carinate scales, and also in the large prseanal scutes, in which both species differ from the L. scincoides, Spix, as figured by Peters in 'Abb. Ak. Berl.' 1862 (1863), pi. 2. fig. 1. It has very much smaller scales, however, than the former species, in all the specimens of which I count only nineteen round the body, while in the present there are not less than thirty-four. This great difference is made by the scales on the sides being much smaller in the species under consideration, while in L. carinicaudatum they are uniform with those of the back. L. dispar, recently described by Prof. Peters, is evidently quite different, being more nearly allied to L. scincoides. Loxopholis rugiceps, Cope, must be a Lizard very similar to both of these species ; and I a m unable to see how its scutellation differs generically from that of Leposoma as represented by L. carinicaudatum, in which Professor Cope describes " four abdominal rows of scales with the keels reduced to an angle and mucro," consequently smooth. The abdominal scales are quadrate in the species which I have now described; and this character appears to be the only one that was left to the genus Loxopholis when Prof. Cope described Leposoma carinicaudatum. Having carefully compared the Lizard brought by Mr. Buckley from Ecuador with the description of Loxopholis rugiceps, I find that the internasal plate is much longer in that species, the prse-frontals more extensively in contact, and the scales much larger, bspeeicnige sin (ttewremnetdyi-aftoeu bre trwoeuennd tthhoes em oifd Ld.l ec aorfi tnhiec abuoddayt)u.m anMdo rtehoev perre stehnet |