118 BOID®. 
2. Boa occidentalis. 
eens; Philippi, Zeitschr. f. ges. Naturw. xli, 1873, p. 127, 
pl. iii. 
Snout slightly prominent. Rostral as broad as deep, not visible 
from above ; symphysial broader than long; head-scales small, largest 
on the snout; no shields; one of the preoculars 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; subcaudals 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 millim. - 
Argentine Republic (provinces Mendoza, San Juan, and Cordoba). 
a. g (Sc.87; V.242; ©.?). Salt Desert, Prov. _ E. C. Knight, Esq. 
Cordoba. (P.}. 
3. Boa diviniloqua. 
Seba, ii. pl. C. fig. 1 (1784). 
? Boa ophrias, Linn. S. N. i. p. 374 (1766). 
Constrictor diviniloquus, Laur. Syn. Rept. p. 108 (1768). 
Boa constrictor, part., Daud. Rept. v. p. 174 (1803); Schleg. Phys. 
Serp. ii. p. 373 (1887). 
—— diviniloqua, Dum. § Bibr. vi. P. 515 (1844); Gray, Cat. p. 100 
(1849) ; Jan, Icon. Gén. p. 81, 1. 5, pl. iii. (1864). 
Snout rather prominent, obliquely truncate. Rostral a little 
broader than deep; symphysial at léast as long as broad ; head-scales 
small, a little enlarged on the snout; no shields; one of the pre- 
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 latetal 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. 52) Dominica. G. A. Ramage, Esq. 
& yg. (Sc. 67; V. 258; C. 60). ©.}. 
ec. Ad., stfid. St. Lucia. Zoological Society. 
d,e. 3 (Sc. 73; V. 275; C. 66) Trinidad. 
& 2 (Se. 67; V. 272; C. 55). ; 
fig. & (Se. 71; V. 274; C. 66) —? Zoological Society, 
& 2 (Se. 71; V. 282; C. 65). | 
i i "hy “br Fh a 
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