234 MR. A. W. E. O'SHAUGHNESSY ON [Feb. 1, 



tendency to form ridges ; those on the lower surface of the tail are 

 also keeled. Femoral pores fourteen. 



millim. 



Total length 115 



Distance from tip of snout to ear-opening. . 1 2 

 „ „ „ fore hmb .. 21 



,y » „ 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 Leposoyna, bearing a resem- 

 blance to L, carinicaudatum, Cope, in the pointed and carinate scales, 

 and also in the large prseanal scutes, in which both species differ 

 from thei. «ciMcofc?e«, Spix, as figured by Peters in 'Abb. Ak. Berl.' 

 1862 (1863), pi. 2. fig. 1. It has very much smaller scales, how- 

 ever, 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 uuilorm with those of the back. 

 L. dispar, recently described by Prof. Peters, is evidently quite dif- 

 ferent, being more nearly allied to L. scincoides. 



Loxopholis rugiceps. Cope, must be a Lizard very similar to both 

 of these species ; and I am unable to see how its scutellation differs 

 generically from that of Leposoma as represented by L. carinicau- 

 datum, 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 prae- 

 frontals more extensively in contact, and the scales much larger, 

 being isitermediate between those oiL. carinicaudatum and the present 

 species (twenty-four round the middle of the body). Moreover the 



