120 BOIDA, 
Closely allied to B. imperator, but with only 55 scales across the 
body. Markings as in that species, but no dark line along the 
middle of the head. 
Mexico. 
6. Boa dumerilii. 
Acrantophis dumerilii, Jan, Icon. Gén. P: 88, 1. 1, pl. ii. (1860) ; 
Bocourt, Miss, Sc. Mex., Rept. p. 522 (1882). 
Snout slightly prominent. Rostral a little broader than deep, not 
visible from above ; symphysial longer than broad ; upper surface 
of head covered with small scales which are not larger than on the 
body; 11 to 16 scales across the forehead, from eye to eye, and as 
many round the eye; preocular large; several slightly enlarged 
loreals; 17 to 19 upper labials. Scales in 59 to 65 rows. Ven- 
trals 225-236 ; anal entire ; subcaudals 20-33. Pale grey-brown 
above, with two longitudinal series of elongate black spots emitting 
a transverse process above, a hoop-shaped figure below; these 
markings may be disposed regularly in pairs and unite by their 
transverse processes, or alternately ; two or three black streaks on 
each side behind the eye, the lower continued in front of the eye to 
the nostril; a black cross line or ring on the forehead between the 
eyes ; lower parts whitish, uniform or spotted with brown. 
Total length 1950 millim. ; tail 110. 
Madagascar. 
a. Hgr. (Sc. 65; V. 225; C. 30). Madagascar. 
b. 3, skin (Sc. 61; V. 236; C. 33). Madagascar, 
c. Several embryos. Madagascar. 
7. Boa madagascariensis. 
Pelophilus madagascariensis, Dum. § Bibr. vi. p. 524 (1844); Gray, 
Cat. p. 102 (1849); Jan, Icon. Gén. p. 85, 1. 2, pl. iv. (1861); 
Boettg. Abh. Senck, Ges, xi. 1877, p. 20. 
Snout scarcely prominent. Rostral broader than deep, not visible 
from above ; symphysial longer than broad ; upper surface of snout 
with small polygonal shields; a large supraocular and a series of 
supraciliaries ; six to nine shields surround the eye; a large pre- 
ocular and two loreals, separated from the labials by a series of 
small shields; 16 or 17 upper labials. Scales in 69 to 77 rows. 
Ventrals 221-235; anal entire; subcaudals 34-41. Pale brown 
above, with elongate dark brown black-edged spots; a vertebral 
series of spots connected by a longitudinal streak ; a lateral series 
of large spots which may, at intervals, run into a band; below the 
latter a series of dark rings or ocelli with light centres; a dark 
streak on each side of the head, running through the eye; lips with 
large black spots; lower parts yellowish white, with small blackish 
spots. 
Total length 1650 millim.; tail 120, 
Madagascar. 
a. 9 (Se. 73; V. 232; C. 34). Madagascar. Zoological Society. 
b, Head of adult, Madagascar.~ Sir E. Belcher (Py 
