300 Mr. A. W. E. O'Shaughuessy on nsw Species of 



Mocoa tetradactyla, sp. n. 



Head broad ; snout obtuse, rounded. Internasal plate broad, 

 its posterior point touching the short pentagonal frontal ; two 

 broad transverse fronto-nasals nearly contiguous; fronto-parie- 

 tal plate very large ; its greatest breadth nearly double that 

 of the frontal, almost triangular, but furnished with a poste- 

 rior projection which reduces the interparietal to the merest 

 rudiment ; two oblique transverse parietals, each followed by 

 two broad posterior plates. Four supraorbital plates. Nos- 

 tril in the hinder and lateral portion of the nasal plate, the 

 anterior angle of which is separated from that of the opposite 

 side by the internasal ; two frenals and three praeoculars, one 

 superior and two inferior. Seven supralabials ; six infra- 

 labials. Transparent disk of lower eyelid very large. Ear- 

 opening moderate. Scales smooth, equal on the sides and 

 belly, in 32 longitudinal series, the middle ventral series 

 between the chin and the vent consisting of 54 scales. 



Anterior limb, when stretched forward, reaching to front 

 angle of eye ; with four toes, the first shorter than the fourth, 

 the second shorter than the third, which is the longest : hind 

 limb reaching forward three fourths the length of the side, 

 with five toes. 



Above olive-brown ; speckled with black on the head. 

 Five longitudinal black lines on the back between the series 

 of scales, and separated from the sides of the body by a 

 broad unbroken stripe of the ground-colour; a bright yel- 

 lowish-brown stripe extends from above the ear- opening 

 along the side to the tail, and another similar stripe between 

 the fore and hind limbs. Lower surface bluish. 



millim. 



Distance of snout from eye 5| 



„ „ ear-opening 12| 



,, „ fore limb 20 



„ ,, vent 55 



Length of fore limb 15£ 



„ third front toe 4 



„ bind limb 20 



The above description is drawn from a single specimen 

 obtained from Mr. Krefft, no locality being affixed to it. As 

 I can see no good distinction between Dr. Gray's genus 

 Carlia and Heteropus, the typical specimen of Carlia mela- 

 nopogon having the scales as distinctly keeled as those of 

 Heteropus fuscus, I prefer leaving the present species, in which 

 the scales are smooth, in Mocoa. 



Mocoa mustelina } O'Shaughn. 

 Lygosoma Jacrymans , Peters (Annali delMus.civ. di Genova, 



