114 IGUANID-S). 



rostralis and supraciliary edge angulur, projeetiug ; nostril pierced 

 below the canthus rostralis, nearer the orbit than the tip o^ 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 

 upj)er 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 miUim. 



Head 36 „ 



Width of head 26 „ 



Body 90 „ 



Fore limb 63 „ 



Hind limb 100 „ 



Tail 200 „ 



Ecuador. 



a. S- Pallatanga. INIr. Buckley [C.]. ) ^m -v 



h. 2 ■ Cauelos. Mr. Buckley [C.]. ( ^^^P^^-) 



3. Enyalioides heterolepis. 



Enyalius heterolepis, Bocourt, Aim. Sc. Nat. (5) xix. 1874, art. 4, 

 and 3Iiss. Sc. Mex., Rept. pi. xx. c. fig. 14. 



Yery 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 ventrals 

 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 ; 



