302 Mr. A. W. E. O'Shaughnessy on new Lizards. 



gonal scales, which, contiguous between the supraorbital disks, 

 diverge anteriorly, forming a group of very large scales, two 

 on each side, on the top of the muzzle. Occipital plate large, 

 irregularly oblong, followed by a small postoccipital ; two 

 large polygonal plates between the former and the supraorbital 

 disk on each side. Supraorbitals composed of a central series 

 of six large plates, with series of hexagonal small scales on 

 each side. Supralabials 7; one exceedingly long infraocular; 

 loreals small, in several series. Three gular folds ; sides of 

 the neck with numerous folds between the ear and the fore 

 limb, and with bunches of projecting scales on the anterior 

 border of the ear and on each side of the neck. A central 

 crest of curved scales from the occiput along the middle of 

 the back and tail. Scales of the back small, keeled ; of the 

 tail larger, keeled; of the belly intermediate in size and 

 smooth. Tail broad, flattened at its base. Upper surface 

 variegated with somewhat ill-defined dark brown crescentic 

 cross bands, leaving narrow spaces of light ground-colour, 

 and covered with irregular yellowish-white clots. Sides 

 bluish. Lower surface yellowish ; gular region clouded with 

 darker. 



millim. 



Distance of snout from eye 11 



„ „ ear-opening 2G 



„ „ fore limb 47 



„ „ vent 116 



Breadth of head 24 



Length of fore limb 52 



„ fourth front toe 15 



„ hind limb 69 



„ fourth hind toe 18 



This species is apparently very similar to Aneuporus occi- 

 pitalis, Boc, referred by Cope to Craniopeltis, Peters. It 

 clearly belongs to that section of the genus Leiocephalus as 

 constituted by Gray which has the large occipital plate 

 characteristic of L. Grayii } Bell, L. microlepis, Gray (a 

 species which we are unable to identify), and the species de- 

 scribed by Peters under the subgeneric name Craniopeltis, as 

 a subdivision of Tropidurus, Wied. 



From all the species now represented in the British Museum 

 it differs by characters which the above description will render 

 apparent ; and the irregularly shaped occipital, rather longer 

 than broad, is a much smaller plate than that of Aneuporus 

 figured by M. Bocourt, in Miss. Scient. au Mexique, pi. xviii. 

 fig. 1. 



Two specimens, the longest of which is 11| inches in 

 length, were collected by Mr. E. White near Cordova. 



