126 IGUANID^. 



1. Diplolaemus darwinii. 



Diplolfemus darwiuii, Oi-ay, Cat. p. 225. 



bibronii, Gray, I. c. 



Diplolfemus darwinii, Bell, I. c. p. 20, pi. x. 



bibronii, Bell, I.e. p. 21, pi. xi. ; A. Dmn. Cat. Meth. JRept. 



p. 68, and Arch. Mus. viii. p. 534. 



Habit stout, Phrynocephalus-VikG. Head rather large, convex, 

 slightly longer than broad ; snout short, rounded, with very short 

 and obtuse canthus rostralis ; nostril directed backwards and up- 

 wards, a little nearer the end of the snout than the orbit; ear- 

 opening vertical, subcrescentic, a little smaller than the eye-opening. 

 Upper head-scales small, more or less convex, smooth, largest on 

 the forehead and on the narrow interorbital space, where they form 

 only two series ; occipital scarcely enlarged ; supraocular scales very 

 small, enlarged towards the supraorbital border ; a series of infra- 

 orbitals, that immediately uader the eye the largest ; labials small; 

 rostral and mental much larger, pentagonal. Dorsal scales very 

 small, equal, granidar, flat, smooth ; ventral scales larger, rhom- 

 boidal, imbricate, smooth ; gular scales smaller than ventrals, juxta- 

 posed or subimbricate, except those in front of the gialar fold, which 

 resemble the ventrals. Limbs short ; the adpressed hind limb 

 reaches the axilla or the neck ; digits short, round, not at all den- 

 ticTilated laterally, with long falciform claws. Tail round, tapering 

 gradually, a little shorter or a little long^ than the head and body, 

 covered with small, juxtaposed, flat, smooth scales. Pale greyish 

 olive above, tinged with rusty ; back usually with regular festooned 

 broad dark cross bands, composed principally of numerous close, 

 small, dark brown spots ; they are bordered posteriorly with yel- 

 lowish ; these bands sometimes less regular, broken up by a ver- 

 tebral or a pair of lateral bands of the light ground-colour ; limbs 

 with transverse dark spots or bands ; tail with regular dark cross 

 bands; lower surfaces yellowish white, uniform or brown-dotted. 



Total length 187 201 millim. 



Head 26 30 



Width of head 24 28 „ 



Body 64 76 „ 



Fore limb 36 38 „ 



Hind Hmb 56 55 „ 



Tail 97 95 „ 



Patagonia. 



a-b. S & hgr. Port Desire. C. Darwin, Esq. [CI. (Types.) 



c-g, h. S, 2i ligi'-) ^ 7S- Poi't Desire. C. Darwin, Esq. [C.J. (Types of 



D. bibromi.) 



{, k. S 2- P^i't I>esu-e. T. Bell, Esq. [P.]. 

 l-m. ?. ? 



