16, caAsaReA,—17, BOLIERIA, 121 
16, CASAREA, 
, Schleg. Phys. Serp. ii. p. 873 (1887). 
Casa rey, eset Miso Je 43 (156) and Cat, Sn. p. 106 
(1849). 
Lepto Dum. § Bibr. Erp. Gén. vi. p. 485 (1844); Jan, Icon, 
Ben 70 "1868). Se Leib 2 eae 
Anterior maxillary and mandibular teeth much longer than the 
posterior. Head very small, distinct from neck; snout covered 
with shields; nostril pierced in a single nasal. Eye small, with 
vertical pupil. Body cylindrical, slender; scales very small, keeled. 
Tail long, prehensile ; subcaudals single. 
Round Island, near Mauritius. 
1, Casarea dussumieri. 
Boa dussumieri, Schleg. Phys. Serp. ii. p. 396 (1837), and Adbild. 
pl. xvii. figs. 1-5 (1839). ; 
Casarea dussumieri, Gray, Zool. Miscell. p. 43 (1842), and Cat. p. 106 
(1849). : 
Lae dussumieri, Dum. § Bibr. vi. p. 186 (1844); Jan, Icon. 
én. p. 79, 1. 2, pl. i. (1861). 
Snout prominent, obliquely truncate. Rostral broader than deep, 
not or but scarcely visible from above; a pair of internasals, one or 
two pairs of preefrontals, and a large supraocular; these shields rough 
with small tubercles; one or two pre- and four to six postoculars ; 
three to five rows of small keeled scales between the supraoculars ; 
eleven or twelve upper labials, second and third in contact with 
the prefrontals, fifth and sixth entering the eye. Scales strongly 
keeled, in 47 to 53 rows. Ventrals 227-235; anal entire; sub- 
caudals 120-133. Pale brown above, uniform or with two dark 
stripes and a lateral series of small dark spots; a dark streak on 
each side of the head, passing through the eye; belly yellowish, 
uniform or with small black spots; lower surface of tail with large 
black spots. 
Total length 660 millim.; tail 180. Reaches a length of 1260 
Round Island, near Mauritius. 
a-b. . (Sc. 47; V. 230; 0.128) Round Island. Sir H. Barkly [P.}. 
& vee 47; V. 227; ©. 120). 
17. BOLIERIA. 
Tortrix .y Schleg. Phys. Serp. ii. p. 1 (1837). 
Bol aia Gray, Zool. Miscell, p. 46 (1842), and Cat. Sn. p. 106 
(1849). 
Platygaster (non Latr.), Dum. § Bibr. Erp. Gén, vi. p. 496 (1844) ; 
Jan, Icon. Gén. Ophid. p. 78 (1865). : 
Anterior maxillary and mandibular teeth a little longer than the 
