30 



COLTTBEIDai. 



II. American species. 



1. Coluber dichrous. 



Herpetodryas dichroa, Peters, Mon. Berl. Ac. 1863, p. 284. 



• occipitalis, Giinth. Ann. Sf Mag. N. H. (4) i. 1868, p. 420, and 



is. 1872, p. 23. 

 Spilotes piceus, Cope, Proe. Ac. Philad. 1868, p. 105, and Journ. Ac. 



Philad. (2) viii. 1876, p. 180. 



Eostral broader than, deep, visible from above ; internasals 

 broader than long, sborter than the prsefrontals ; frontal nearly once 

 and a half as long as broad, a little longer than its distance from the 

 end of the snout, shorter than the parietals ; loreal nearly as long 

 as deep; one prse- and two postooulars; temporals 2 + 2, rarely 

 1-1-2; eight upper labials, fourth and fifth, and usua,lly also the 

 third, entering the eye ; four or five lower labials in contact with 

 the anterior chin-shields, which are much shorter than the posterior. 

 Scales smooth, in 15 rows. Ventrals 161-176 ; anal entire ; sub- 

 caudals 87-101. Adult uniform olive-brown or blackish olive above 

 and on the sides of the ventrals, yellowish white inferiorly. Young 

 black above, with narrow yellowish cross bands ; head yeUow or 

 pale olive, the shields on the snout edged with black, with a large 

 black patch covering the forehead, a black spot below the eye, and 

 a blackish bar across the occipital region, or a pair of large black 

 blotches on the parietal shields and oa the occiput. 



Total length 1310 millim. ; tail 360. 



Brazil and North-eastern Peru. 



a, b. 3 (V. 166, 169 ; 0. 98, 97). Bahia. 

 c. Yg. (V. 175 ; C. 96). Pebas. 



d-e. cJ (V. 161, 169; 0. 94, 87). Pebas. 



Dr. 0. Wucherer [0.1. 

 Mr. Hauxwell [0.]. 

 (Type of -fir. occipitalis.) 

 Mr. E. Bartlett [0.]. 



