26, LIOCEPHALUS. 161 
Pristinotus, Gravenh, N. Acta Ac. Leop-Carol, xviii. 1838, ii. p. 738. 
Scelotrema, Tschudi, Faun. Per., Herp. p. 27*. 
Ophryoessoides, 4. Dum. Cat. Méth. Rept. p. 66, and Arch. Mus. viii. 
5380 
p. 530. 
Brachysaurus, Hallow. Proc, Ac. Philad. 1856, p. 232. 
Tympanum distinct. Body more or less compressed; a more or 
less developed dorsal crest ; dorsal scales uniform, imbricate, keeled. 
Upper head-scales small or enlarged, smooth or keeled; no large 
occipital. No transverse gular fold; no gular sac. Digits com- 
pressed, with keeled lamelle inferiorly. No femoral or preanal 
pores. Tail long, more or less compressed and crested. Lateral 
teeth tricuspid; pterygoids usually toothed. A sternal fontanelle. 
Abdominal ribs. 
West Indies; South America. 
Synopsis of the Species. 
I. Parietal plates distinct ; a series of band-like transverse supra- ‘ 
oculars. 
A. Parietal plates longitudinally divided ; nasal in contact with 
the rostral. 
1. Ventral scales smooth. 
w. Outer parietals not twice as large as inner. 
a. Caudal crest not higher than dorsal. 
Side of neck granular; adpressed hind 
limb not reaching the eye .......... 1. schreibersiz, p. 162. 
Side of neck, for a short distance posterior 
to the ear-opening, granular ; adpressed 
hind-limb quite or nearly reaching end 
OF SNOUT oo as oes ec ach sae dane oeed 2. macropus, p. 163. 
Side of neck entirely covered with imbri- 
cate, pointed, keeled scales; adpressed 
hind limb not reaching beyond the eye 3. vittatus, p. 163. 
(. Caudal crest higher than dorsal. 
Keels of the dorsal scales unusually strong 4. melanochlorus,p.164. 
Upper head-scales striated ; a black band 
on the side of the head, passing through 
DAO OYE cack dead tae a4 hewtntds are 5. personatus, p. 164. 
Upper head-scales smooth, except the su- 
praoculars; dorsal scales larger than 
VENtrale> hain io ca tae whee teed aa he 6. eremitus, p. 165. 
* The small pouch between the tail and the base of the hind limb, noticed by 
Tschudi, is more or less distinct in specimens of L. aculeatus, trachycephalus, 
and guentheri; it is most developed in L. ornatus. 
VOL, II. M 
