11. ENYALIOIDES. 113 



about 12 longitudinal series of scales 

 between the dorsal crest and the lateral 



series 4. oshauglmessyi, p. 115. 



Ventral scales sharply keeled ; a single 

 series of larger scales on each side ; 

 dorsal scales extreroely small 5. microhpis, p. 115. 



B. Nuchal crest not continuous with 

 dorsal ; supraeiliary edge much pro- 

 duced ; ventral scales sharply keeled 6. pdlpebralis, p. 116. 



1. Enyalioides laticeps. 



Enyalius laticeps, Guichen. in Casteln. Amer. Mer,, Sept, p. 20, pi. v. ; 



A. Dum. Arch. Mm. Tiii. p. 529. 

 planiceps, Guichen. I. c. p. 21, pi. vi. 



Head large, short, rounded, its length equalling nearly once and 

 a third its width ; canthus rostralis and supraeiliary edge angular, 

 projecting ; nostril pierced below the canthus rostralis, nearer the 

 orbit than the tip of the snout ; tympanum vertically oval, as large 

 as the eye-opening. Upper head-scales small, equal, tubercular, 

 strongly keeled or subcorneal ; occipital scarcely enlarged ; eleven 

 or twelve upper, and ten or eleven lower labials. Gular scales, 

 uniform large oval smooth granules. Nuchal crest formed of large 

 conical scales, the largest being nearly as long as the vertical 

 diameter of the tympanum ; on the back, the crest becomes very 

 low, and is reduced to a feebly serrated ridge. Dorsal and lateral 

 scales very small, equal, subrhomboidal, juxtaposed or feebly imbri- 

 cate, feebly keeled ; ventrals larger, squarish, smooth or indistinctly 

 keeled. Limbs long, covered with equal, keeled scales ; the adpressed 

 hind limb reaches the anterior border of the orbit ; digits long and 

 slender, feebly denticulated. Three femoral pores on each side. Tail 

 feebly compressed, oval in section, not crested, covered with subequal 

 keeled scales, largest inferiorly ; the length of the tail equals nearly 

 twice that of head and body. Green above, with irregular brown 

 spots ; tail with regular brown annuli ; throat green, belly white. 



Total length 352 millim. 



Head 32 „ 



Width of head 25 „ 



Body 90 „ 



Fore limb 66 ,, 



Hind limb 113 „ 



TaU 230 „ 



Upper Amazons. 



a. $ . Pallatanga, Ecuador. Mr. Buckley [C.]. 



2. Enyalioides prsestabilis. 



Enyalius praestabiUs, OShauyhn, Proc. Zool. Soc. 1881, p. 240, pl.xxv. 

 fig.l. 



Head large, nearly once and a half as long as broad ; canthus 



VOL. II. i 



