126 IGUANIDE, 
1. Diplolemus darwinii. 
Diplolemus darwinii, Gray, Cat. p. 225. 
bibronii, Gray, 1. ¢. 
Diploleemus darwinii, Bell, 1. c. p. 20, pl. x. 
bibronii, Bell, lc. p. 21, pl. xi.; A. Dum. Cat, Méth. Rept. 
p. 68, and Arch. Mus. viii. p. 534, 
Habit stout, Phrynocephalus-like. 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 under the eye the largest ; labials small ; 
rostral and mental much larger, pentagonal. Dorsal scales very 
small, equal, granular, flat, smooth; ventral scales larger, rhom- 
boidal, imbricate, smooth ; gular scales smaller than ventrals, juxta- 
posed or subimbricate, except those in front of the gular fold, which 
resemble the ventrals. Limbs short; the adpressed hind limb 
reaches the axilla or the neck; digits short, round, not at all den- 
ticulated laterally, with long falciform claws. Tail round, tapering 
gradually, a little shorter or a little longer 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. 
d. i 
Total length...... 187 a1 millim. 
Head .......... 26 30, 
Width of head.... 24 Zo: os, 
Body dc eagiuting 64 LO2 35, 
Fore limb ...... 36 38 Ci, 
Hind limb ...... 56 55, 
Dates 6 Ava gs bts i 97 95, 
Patagonia. 
ab. 3 & her. Port Desire. C. Darwin, Esq. [C.]. (Types.) 
c-g,h. 3, 2, her, & yg. Port Desire. C. Darwin, Esq. is? (Types of 
D. bibronit.) 
i,k. SQ. Port Desire. T. Bell, Esq. [P.]. 
im 9. 2 
