120 BOIDJS. 



Closely allied to B. irryperator, 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. Gen. p. 83, 1. 1, pi. ii. (1860) ; 

 Bocourt, Miss. Sc. Mex., Sept. p. 622 (1882). 



Snout slightly prominent. Eostral 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 ; prseoeular 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 j 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; 0. 30). Madagascar. 



*. J, skin (Sc. 61; V. 236; 0. 33). Madagascar. 



c. Several embryos. Madagascar. 



7. Boa madagascariensis. 



Pelophilus madagascariensis. Bum. <§• Bibr. vi. p. 524 (1844) ; Cfray, 

 Cat. p. 102 (1849) ; Jan, Icon. Gin. p. 85, 1. 2, pi. iv. (1861) ; 

 Boettg. Ahh. Sench. Ges. xi. 1877, p. 20. 



Snout scarcely prominent. Eostral 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 prse- 

 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. 2 (Sc. 73 ; V. 232 ; C. 34). Madagascar. Zoological Society. 



&. Head of adult. Madagascar. Sir E. Belcher [P.]. 



