26. LIOCEPHALUS. 167 
9. Liocephalus aculeatus. (Prare XI.) 
Leiocephalus aculeatus, O'Shaughn. Ann. § Mag. N. H. (5) iv. 1879, 
p- 808, and Proc. Zool. Soc. 1881, p. 248. 
Upper head-scales large, smooth or feebly striated; nostril per- 
fectly lateral; nasal usually separated from the rostral; supra- 
orbitals in contact; supraoculars three or four large transverse, 
separated from the supraorbitals by a series of small scales; a smaller 
anterior and a larger posterior parietal on each side, separated by 
three shields, viz. a pair of interparietals and an occipital; supra- 
temporal edge with two projecting scales. Sides of neck not folded, 
covered with sharply pointed, imbricate, keeled scales. Dorsal crest 
a low serrated ridge; a weaker lateral crest on each side of the 
back. Dorsal scales keeled only on their posterior half; lateral 
scales similar ; ventrals a little larger, strongly keeled, ending in a 
long sharp point; thirty-three to forty-one scales round the middle 
of the body. The adpressed hind limb reaches the anterior border 
of the orbit. Tail very long, compressed, with serrated upper edge. 
Bronzed green or brown above, with more or less distinct angular 
darker cross lines on the back and vertical bars on the sides; lower 
surfaces green or bronzy, belly sometimes pinkish ; the male's throat 
black. 
millim. millim 
Total length ...... 363 Fore limb ........ 49 
GAs ie. oisacaceea tea tes 24 Hind limb........ 85 
Width of head .... 20 Pai cice-tssGrandieesteae 255 
Bod yee eek eises 84 
Ecuador; Northern Peru. 
a-d. 3, 2,& her. Moyobamba. Mr. A. H. Roff (C.]. 
(Types. 
e-g. d & her. Pallatanga, Ecuador. Mr. Buckley (2 
h, Her. Canelos, Ecuador. Mr. Buckley (C.]. 
10. Liocephalus iridescens. 
Liocephalus iridescens, Giinth. Proe. Zool. Soc. 1859, p. 409, pl. xx. 
fig. B; Cope, Proc. Ac. Philad. 1868, p. 121. 
Upper head-scales large, smooth ; nostril superior ; nasal sepa- 
rated from the rostral; supraorbitals in contact; four or five large 
transverse supraoculars, usually separated from the supraorbitals by 
a series of small scales; a smaller anterior and a larger posterior 
parietal on each side; an interparietal and an occipital, separated 
by a pair of larger shields. Sides of neck not folded, covered with 
sharply pointed, imbricate, keeled scales. Dorsal crest low. Dorsal 
scales not very strongly keeled; lateral scales scarcely smaller ; 
ventrals a little larger, pointed, smooth, or feebly keeled ; thirty- 
seven to forty-three scales round the middle of the body. The 
adpressed hind limb reaches the cye or the anterior border of the 
orbit. Tail strongly compressed, crested like the back. Bronzy 
