114 IGUANIDA, 
rostralis and supraciliary edge angulur, projecting ; nostril pierced 
below the canthus rostralis, nearer the orbit than the tip of the 
snout ; tympanum vertically oval, nearly as large as the eye-opening. 
Upper head-scales small, very convex or pointed and erect, largest 
and conical above the temporal region ; no distinct occipital ; ten 
upper and nine lower labials. Male with a gular pouch; gular 
scales as large as ventrals, convex, elongate, the central erect. 
Dorsal and nuchal crests continuous, formed of conical scales, gra- 
dually decreasing in height to the base of the tail; the longest spines, 
on the nape, measure less than the vertical diameter of the tym- 
panum. Back and sides covered with small almost uniform pointed 
and keeled scales, from thirty-four to forty in a vertical series be- 
tween the ventral scales and the dorsal crest; only a very indistinct 
lateral series of larger scales on each side ; ventral scales smooth or 
indistinctly keeled. The adpressed hind limb reaches the eye in the 
male, the temple in the female; digits shorter than in the preceding 
species. <A single femoral pore on each side. Tail compressed, ringed 
with keeled scales of unequal size, forming segments ; a double keel 
along its upper surface; the length of the tail about once and a half 
that of head and body. Reddish or purplish-brown above, dotted 
over with green; a round yellowish spot behind the ear; tail with 
more or less distinct broad brown and narrow lighter annuli; lower 
surfaces yellowish ; male with the gular pouch black. 
Total length .......... 326 millim. 
Head: |. 6c aseviye don se 36 Cy, 
Width of head ........ 26 —=C&«, 
Body eyed owen e 90 45 
Forelimb ypu guadanes 63, 
Hind lim 5, cect aca ges 100 _——=, 
Pail: ; scenes 200 =, 
Ecuador. 
a 3. Pallatanga. My. Buckley [C.}. 
bd Q. Chnela My, Huciley et! Chypee) 
3. Enyalioides heterolepis. 
Enyalius heterolepis, Bocourt, Ann. Sc. Nat. (5) xix. 1874, art. 4, 
and Miss, Se. Mex., Rept. pl. xx. ¢. fig. 14. 
Very similar to the preceding, from which it differs in the fol- 
lowing points :—Head shorter ; labials twelve ; gular scales keeled. 
Nuchal and dorsal crests lower, the spines of the former measuring 
only half the diameter of the tympanum. Dorsal and lateral scales 
strongly heterogeneous, the larger scales forming two longitudinal 
series on each side of the back, and irregular vertical series on the 
flanks; about thirty scales in a vertical series between the veutrals 
and the dorsal crest; ventrals keeled. Limbs with transverse rows 
of enlarged scales. Three or four femoral pores on each side. Light 
brown above, varied with greenish ; lower surfaces yellowish white ; 
