17. PRIONODACTYLTJS. — 18. CERC09AURA. 395 



along the middle of the back and the upper surface of the tail ; a 

 narrow whitish line along the upper labials to the arm-pit ; a series 

 of very small white ocelli surrounded by black rings along the side 

 of the body, and a few on the limbs ; a larger ocellus at the junction 

 of the fore'arm and the chest ; lower surfaces lead-coloured, sprinkled 

 with blackish. 



millim. millim. 



Total length 98 From end of snout to vent 33 



Head 9 Fore limb 12 



Width of head 5"5 Hind limb 18 



From end of snout to fore Tail 65 



limb 1^ 



Ecuador. 



a. Hgr. lutac. Mr. Buckley [C.]. (Type.) 



18. CERCOSAURA. 



Cercosaura, Wagler, Sijst. Amph. p. 158 ; Wiegm. Herp. Mex. p. 10 ; 



Peters, Ahh. Bed. Ac. 18G2, p. 174. 

 Emmiiiia, Gray, Cat. Liz. p. 24. 

 Cercosaura, part., Grcuj, I. c. p. 60. 



Tongue moderately elongate, arrow-headed. Lateral teeth com- 

 pressed, hi- or tricuspid. Head with large regular shields ; fronto- 

 nasal separating the nasals ; prefrontals and frontoparietals present ; 

 nostril pierced in the middle of a single nasal. Eyelids developed, 

 lower with a transparent disk composed of several scales. Ear 

 exposed. Limbs well developed, pontadactyle. Dorsal scales large, 

 subquadrangular, slightly imbricate, strongly keeled, arranged in 

 regular transverse and longitudinal series ; lateral scales small ; 

 ventral plates large, quadrangular, smooth, arranged in regular 

 longitudinal and transverse series. An indistinct collar fold. Fe- 

 moral pores few. Tail cyclotetragonal. 



Brazil. 



1. Cercosaura ocellata. 



Emminia olivacea, Gray, Cat, p. 24. 



Cercosaura ocellata, Gray, I. c. p. GO. 

 Cercosaura ocellata, Wayl. I. c. ; Peters, I. c. p. 175, pi. i. fig. 1. 

 Emaiiuia olivacea, Gray, Proc. Zool. Sac. 1851, pi. vi. fig. 2. 

 Cercosaura humilis, Peters, I. c. p. 180, pi. i. fig. 2. 

 olivacea, 0' Shaiujhn. Proc. Zool. 8oc. 1881, p. 228. 



Head depressed, body moderately elongate. Ear-opening large. 

 The ordinary head-shields ; interparietal largo, longer than the 

 parietals ; two largo lateral and a small median occipital ; four 

 supraoculars; a lorcal and afreuoorbital ; temples with large shields 

 superiorly, scaly inferiorly ; six upper and four or five lower labials ; 

 chin-shields very large, one anterior and four paii-s, the first two pairs 

 in contact on the median line, thi.' two others separated by a row of 



