Mr. G. A. Boulengcr on Three new Snakes. 451 



lower parts black, uniform or with a msdiair series of small 

 whitish spots on tlie anterior part of the body. 



Total length 570 mm. ; tail 110. 



Two specimens from Efulen, S. Cameroon; collected by 

 Mr. G. L. Bates. 



Atractus vertehralis. 



Snout rounded. Rostral small, broader than deep, just 

 visible from above ; internasals very small ; prrefrontals as 

 long- as broad ; frontal as long as broad, as long as the prai- 

 frontals, two thirds the length of the parietals; loreal twice 

 and a half as long as deep ; two postoculars ; temporals 1 + 2 ; 

 seven or eight upper labials, third and fourth or fourth and 

 fifth entering the eye; four lower labials in contact with the 

 single pair of chin-shields, which, are rather elongate, mode- 

 rately broad, and separated from the symphysial. Scales in 

 17 rows. Ventrals 173 ; anal entire; subcaudals 21. Brown 

 above, with small black spots and a black vertebral streak 

 edged with yellowish ; upper surface of head blackish ; upper 

 lip yellowish ; ventral shields yellow in the middle, black on 

 the sides, one or two shields here and there entirely black 

 and forming cross-bars on the belly. 



Total length 470 mm.; tail 35. 



A single female specimen from Santo Domingo, Carabaya, 

 Peruvian Andes, altitude 6000 feet; collected by Mr. G. 

 Ockenden. 



Ajyistocal.imus Pratti. 



Snout short, rounded. Rostral a little broader than deep, 

 the portion visible from above measuring one third its 

 distance from the frontal ; internasals half the length of the 

 prsefrontals ; frontal slightly longer than broad, as long as 

 its distance from the end of the snout, much shorter than the 

 parietals ; nostril between two nasals *, the posterior forming 

 a suture with the single prseocular, which is nearly twice as 

 long as deep; a single postocular ; temporals 1-fl; six 

 ujjper labials, third and fourth entering the eye; three lower 

 labials in contact with the anterior chin-shields; posterior 

 chin-shields smaller, separated by a large scale. Scales in 

 15 rows. Ventrals 190; anal divided ; subcaudals 41, partly 

 single, partly paired. Olive- brown above; an oblique 

 yellowish streak on each side of the nape ; upper lip 



* The discovery of this species necessitates an alteration iu the generic 

 diagnosis (Ann. Mus. Geneva, '2, xviii. 1898, p. 705), as the Urst labial 

 and the interuasal do not border the nostril. 



