SNAKES. 101 



Rept. iii. 133. Daud. Kept. v. 195. ? B. Divinatrix, Lacep. Q. O. 

 ii. 338, Ll6,f.l. 



Muzzle obliquely truncated ; rostral feebly nicked at the base. 



Inhab. St. Lucia. Gardens Zool. Soc. 



ff One of the hinder phrenals rather larger than the rest ; muzzle 



truncated. 



3. The Emperor Boa. Boa imperator, Daud. Rept. v. 150. 

 Dum. Sf- Bib. Erp. Gen. vi. 519. B. constrictor, iS. Merrem, Tent. 

 86. 



The rostral plate rather narrower and slightly nicked below ; 

 the chin shield moderately high, triangular, equal sided, with the 

 two larger sides concave ; twenty scales above the muzzle between 

 the nasal shields : orbit completely surrounded by sixteen or seven- 

 teen scales ; one of the phrenal scales near the orbit rather larger than 

 the rest, but never equal to the size of the globe of the eyes : a brown 

 stripe on each side of the neck. 



a. In spirits. Young. Mexico ? Presented by Edward Cooke, 



Esq. 



b. Skin. Young. Honduras. From Mr. Dyson's collection. 



fif One of the hinder phrenals much larger than the rest. 



4. The Chevalier Boa. Boa Eques (Boa Chevalier), Eydoux 

 and Souleget, Voy. Bonite, Zool. t. 4, 1842. Dum. 4' Bib. Erp. 

 Gen. vi. 521. 



The rostral plates one-third narrower below than at the tip 

 and strongly nicked ; the chin shield triangular, with the longer 

 sides concave ; twenty or more scales on the muzzle between the 

 nasal ; orbit surrounded by twelve or thirteen scales ; one of the 

 phrenal scales near the orbit much larger than the others, and as 

 large as the globe of the eye. 



Inhab. Peru. Mus. Paris. 



12. Pelophilus. 



Head covered with scales behind and shielded in front: nos- 

 trils lateral, between two plates : eyes lateral ; pupil elliptical, erect : 

 lip shields flat, without pits : body thick, compressed : scales flat, 

 smooth : subcaudal shields one-rowed. 



Pelophilus, Dum. Sr Bib. Erp. Gen. vi. 523, 1844. 



k3 



