116 IGTTANID^. 



upper and as many lower labials. Male with a gular pouch ; gular 

 scales smaller than ventrals, strougly keeled, trihedral, the central 

 erect. Dorsal and nuchal crests continuous, formed of short conical 

 scales ; those of the former largest, measuring about half the vertical 

 diameter of the tympanum, and frequently arranged in three longi- 

 tudinal closelj'-set rows. Back and sides with very small scales of 

 somewhat unequal size ; a lateral series of larger scales, from the 

 shoulder to the base of the tail ; the scales on the flanks minute and 

 granular, those on the back a little larger, pointed, and keeled ; 

 ventral scales strongly keeled. Limbs and tail as in E. prcestahilis^ 

 the former, however, a little shorter. One or two femoral pores on 

 each side. Pale brown, variegated with darker ; a yellowish spot 

 behind the ear, sometimes replaced by a longitudinal baud of the 

 same colour ; tail with rather irregular dark brown annuli ; lower 

 surfaces yellowish, the male's throat bluish-black. 



Total length 263 millim. 



Head 33 „ 



Width of head 25 „ 



Body 80 „ 



Fore limb 59 „ 



Hind limb 88 „ 



Tail 150 „ 



Ecuador. 



a,b.(S9.- W. Ecuador. Mr. Eraser 



c. Hgr. 5 • Guayaquil. Mr. Eraser 



C. 

 C. 



d-e. S aud hgr. Sarayacu. Mr. Buckley [C.J. 



■ (Types.) 



6. Enyalioides palpehralis. 



Enyalius palpebralis, Bouleng, Proc. Zool. Soc. 1883, p. 46, pi. x. 



Head large, once and one third as long as broad ; canthus ros- 

 tralis angular ; suj)raciliary edge much produced posteriorly, with a 

 strong denticulation formed by several large pointed scales ; nostril 

 pierced below the canthus rostralis, nearer the orbit than the tip of 

 the snout ; tympanum vertically oval, nearlj' as large as the eye- 

 opening. Upper head-scales small, irregular, strongly keeled or 

 conical ; three large conical tubercles behind the supraciliary border, 

 followed by an oblique series of smaller conical tubercles ; no distinct 

 occipital ; twelve to fifteen upper and as many lower labials. Male 

 with a very slightly developed gular pouch ; gular scales smaller 

 than ventrals, keeled, the median subcorneal. A nuchal crest formed 

 of four to six large conical scales, the highest measuring the vertical 

 diameter of the tympanum, separated from the dorsal crest by an 

 interspace nearly equal to its length ; a strong dorsal crest, gradually 

 diminishing in height to the base of the tail, where it becomes double 

 and indistinct ; the highest scale of the dorsal crest measuring three 

 fourths the vertical diameter of the tympanum. Scales of the back 

 and sides very small, irregular, keeled, intermixed with larger conical 



