132 IGUANID, 
Synopsis of the Species. 
I. Posterior dorsal scales larger than ventrals, and smaller than 
the caudals, which are strongly spinose. 
Fifth toe extending as far as second; 
posterior dorsal scales only a little larger 
than the anterior .................. 1. marmoratus, p. 132. 
Fifth toe extending as far as second; 
posterior dorsal scales very much larger 
than the anterior ..............005 2. torquatus, p. 133. 
Fifth toe not extending as far as second; 
a dorsal denticulation .............. 3. roseiventris, p. 133. 
II. Posterior dorsal scales not larger than ventrals. 
Dorsal scales considerably smaller than 
a5) 141) 20 (ce 4. humeralis, p. 134. 
Dorsal scales nearly as large as ventrals.. 5. varius, p. 134. 
III. Dorsal scales large, as large as or scarcely smaller than the 
caudals, 
The adpressed hind limb reaches slightly 
beyond the tympanum; scales on the 
side of the neck smaller than those on 
Phe teniplcs.s% set as hed ac daca aes 6. cupreus, p. 135. 
The hind limb reaches the eye; scales on 
the side of the neck larger than those on 
the'temple. .¢ni4 cue gw aranewanees 7. mestus, p. 136. 
1. Stenocercus marmoratus. 
Trachycyclus marmoratus, Gray, Cut. p. 219. 
Trachycyclus marmoratus, Dum. § Bibr. iv. p. 356, pl. xxxix. bis. 
fig. 1; D’Orb. Voy. Am. Mér. v. Rept. p. 8, pl. iv. figs. 4-8. 
Heterotropis (Trachycyclus) marmoratus, Fitzing. Syst. Rept. p. 71. 
No pterygoid teeth. Ear-opening with two tubercular scales in 
front. Sides of neck folded, studded with small tubercles. Body 
subcylindrical. No dorsal denticulation. Dorsal scales transversely 
rhomboidal, keeled, not mucronate, the keels obliquely converging 
towards the dorsal line; gular and ventral scales imbricate, smooth, 
the latter a little broader than long. Hind limb with large, strongly 
keeled, spinose scales; when stretched forwards, it reaches hardly 
the ear; fifth toe reaching as far as second. ‘Tail alittle longer than 
head and body, thick, conical, slightly depressed at the base, covered 
with whorls of large spinose scales. Upper surfaces fulvyous ; back 
marbled with brown; limbs and tail with transverse brown bands: 
lower surfaces white. e 
Head: oo5 6 i garcohheewaces 4 6 
