118 BOID^. 



2. Boa occideutalis. 



Boa occidentalis, PMlippi, Zeitschr. f, ges. Naturw. xli. 1873, p. 127, 

 pi. iii. 



Snout slightly prominent. Rostral as broad as deep, not visible 

 from above; sympbysial broader than long ; head-scales small, largest 

 on the snout ; no shields ; one of the prseoculars slightly enlarged ; 

 15 to 18 scales across the forehead, from eye to eye ; 16 to 20 scales 

 round the eye, which is separated from the labials by two or three 

 series of scales ; 21 or 22 upper labials. Scales in 64 to 87 rows. 

 Ventrals 242-251 ; anal entire ; suboaudab 45. Dark brown above, 

 with yellowish markings, mostly in the form of rings and small 

 spots ; head brown, with the markings as in B. constrictor, but less 

 distinct and bordered with yellowish ; lower parts yellowish, dotted 

 and marbled with brown. 



Total length 2200 miUim. 



Argentine Eepublic (provinces Mendoza, San Juan, and Cordoba). 



a. S (Sc. 87 ; V. 242 ; C, ?). Salt Desert, Prov. E. C. Knight, Esq. 



Cordoba. [P.]. 



' "' ( ( 3. Boa diT4Bil«q»a. a^MtA/uc^ J^, ^ 



8eba, ii. pi. C. %. 1 (1734). / 



? Boa ophrias, Linn. S. N. i. p. 874 (1766). 



Constrictor divinUoquus, Law. Syn. Sept. p. 108 (1768). 



Boa constrictor, part., Daud. Sept. v. p. 174 (1803) ; Schleg. Phys. 



Serp. ii. p. 373 (1837). 

 diviniloqua, Dum. 8f £ibr. vi. p. 515 (1844) ; Cfray, Cat. p. 100 



(1849) ; Jan, Icon. GSn. p. 81, 1. 5, pi. iii. (1864). 



Snout rather prominent, obliquely truncate. Eostral a little 

 broader than deep ; symphysial at least as long as broad ; head-scales 

 small, a little enlarged on the snout ; no shields ; one of the prse- 

 oculars slightly enlarged ; 18 to 20 scales across the forehead, from 

 eye to eye ; 14 to 19 scales round the eye, which is separated from 

 the labials by one or two rows of scales. Scales in 65 to 75 rows 

 of scales. Ventrals 258-275 ; anal entire ; subcaudals 55-69. 

 Brown or olive above, with 25 to 30 darker spots or cross bands on 

 the body, and a lateral series of spots and vertical bars with light 

 centres ; head-markings as in B. constrictor, but sometimes rather 

 indistinct ; the longitudinal line on the head broader, often inter- 

 rupted or scalloped ; tail black and yellow ; lower parts yellowish, 

 spotted and dotted with* black or olive, sometimes entirely blackish. 



Total length 2100 millim. ; tail 170. 



Dominica, St. Lucia, Trinidad. 



a-b. 2 (Sc. 69 ; V. 265 ; C. 62) Dominica. G. A. Ramage, Esq. 



& yg. (Sc. 67 ; V. 268 ; C. 60). [C.]. 



c. Ad., stfFd. St. Lucia. Zoological Society. 



d, e. (J (Sc. 73; V. 275 ; C. 66) Trinidad. 

 & ? (Sc. 67; V.272; C. 55). 



f.g. c? (Sc. 71; V. 274; C. 66) ? ' Zoological Society. 



& ? (Sc.71; V, 282; C. 65). 



