170 IGUANIDA. 
rostral; no large supraoculars ; ear-opening with a more or less dis- 
tinct denticulation in front. Sides of neck not distinctly plicate, 
covered with pointed, imbricate, keeled scales. Dorsal crest a low 
serrated ridge. Dorsal scales small, not or but scarcely mucronate, 
strongly keeled, the keels forming slightly oblique continuous lines ; 
laterals and ventrals as large as dorsals; latter rhomboidal, smooth ; 
sixty-one to seventy-five scales round the middle of the body. 
The adpressed hind limb reaches the shoulder or the ear. Tail 
moderately compressed, with feebly serrated ridge. Olive- or 
bronze-green, uniform or with lighter or darker spots ; lower 
surfaces metallic, sometimes marbled with blackish: throat usually 
green; males usually with a black band across the throat, some- 
times extending to the chest ; sometimes a small black spot on the 
shoulder. 
millim. millim 
Total length ...... 250 Fore limb ........ 34 
Headey sh eae 20 Hind limb........ 57 
Width of head .... 16 MD aA, ayspraesscesetick eas 165 
BOA a d.ntiex aoa 65 
Ecuador 
abe. dQ. Guayaquil. Mr. Fraser [C.]. 
d,e,f.dQ. W. Ecuador. Mr. Fraser tet 
g &. Sarayacu, Ecuador. Mr. Buckley [C.]. 
h. oS. Colombia P 
t, Several specs.: d, ? J. Brenchley, Esq. [P.]. 
2, & her. 
k-l,m,n. 3 @. —-? 
16. Liocephalus tricristatus. 
Ophryoessoides tricristatus, 4. Dum. Cat. Méth. Rept. p. 66, and 
Arch, Mus. viii. p. 531, pl. xxii. fig. 1. 
A strong supraciliary crest; upper head-scales small, keeled ; 
nostril lateral. Sides of neck not folded. Dorsal and ventral 
scales large, keeled. Dorsal crest a low serrated ridge; another 
similar ridge on each side of the back. Tail feebly compressed. 
Light brown above; back with transverse, brown, yellow-edged 
bands; similar vertical bands on the sides. 
Head and body 60 millim.; tail 100 millim. 
Brazil. 
17. Liocephalus dumerilii. 
Ophryoessoides dumerilii, Steindachn. Novara, Rept. p. 38, pl. ii. 
fig. 5. 
Apparently allied to the preceding. The supraciliary crest ends 
in a large pyramid-shaped tubercle; temple with large tubercular 
shields. Light yellowish-brown above ; a series of triangular dark 
reddish-brown spots on each side of the dorsal line. 
Pard. 
