522 Balracliians and Reptiles from Colomhia. 



surface of tibia, where they are faintly keeled. 9 or 10 

 femoral pores on each side. Caudal scales smooth, quad- 

 rangular, forming regular annuli. Blackish brown, with 

 scattered white dots above, these dots being in the centre of 

 large round black spots; ventral plates edged with whitish 

 behind. 



mm. 



Total lene-th 100 



Head... 10 



Width of head 11 



From end of snout to fore limb 30 



„ „ vent 72 



Fore limb 22 



Hind limb 2-5 



Tail 88 



A single male specimen from San Antonio. 



Geophis nigro-alhas. 



Maxillary not extending beyond jialatine in front, the first 

 tooth corresponding to the suture l)etween the second and 

 third lal)ial shields. Eye small, nearly as long as its distance 

 from the mouth. Rostral rather large, a little broader than 

 deep, the portion visible from above measuring about one- 

 third its distance from the frontal ; internasals broader than 

 long, one-third the length of the prfefroutals, which are as 

 long as broad ; frontal broader than long, as long as its 

 distance from the rostral, much shorter than the parietals ; 

 supraocular small, but more than twice as large as the 

 })Ostocular; loreal twice as long as deep ; one postocular ; six 

 upper labials, third and fourth entering the eye; three or 

 four lower labials in contact with the anterior chin-shields, 

 which are slightly longer than the posterior and separated 

 from the symphysial. Scales in 15 rows, smooth on the 

 anterior part of the body, feebly but distinctly keeled on the 

 posterior part. Ventrals 142 ; anal entire ; subcaudals 42. 

 Blackish above ; head behind the supraoculars and frontal 

 and lower parts white. 



Total length 135 mm. ; tail 25. 



A single young s{)ecimcn from Pavas. 



Very closely allied to O. hojfmanni, Peters. 



