30 



COLUBRID.E. 



II. American species. 



1. Coluber dichrons. 



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



- occipi tails, Giinth. Ann. # Mag. N. H. (4) i. 1868, p. 420, and 



ix. 1872, p. 23. 

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



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



Rostral broader than deep, visible from above ; internasals 

 broader than long, shorter than the praefrontals ; 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 prae- and two postoculars ; temporals 2 + 2, rarely 

 1 + 2; eight upper labials, fourth and fifth, and usually also the 

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

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

 Scales smooth, in 15 rows. Yentrals 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 yellow 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 on the occiput. 



Total length 1310 millim. ; tail 360. 



Brazil and North-eastern Peru. 



a,b. <J (V. 166,169; C. 98, 97). 

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



d-e. <? (V. 161, 169; C. 94, 87). Pebaa. 



Bahia. Dr. 0. Wucherer [C.J. 



Pebas. Mr. Hauxwell [C.J. 



(Type of H. occipitalis.) 

 Mr.E. Bartlett[C.]. 



