30 



COHJBRID^. 



II. American species. 



dichrotis 



corals 



nov(S-hispani 

 melanotropis 



triaspis 



chlorosoma... 

 flaviriifus ... 



guttatus 



vulpinus ... 



laf.us 



ohsoktus 



lineaticollis 



arizonm 



deppii 



catenifer ... 

 melanoleucus 



Labials entering eje. 



4th, 5th, or 3rd, 4th, 5th. 



3rcl, 4th, or 4th, 5th. 



4th, .5th. 



4th, 6th, 6th. 



4th, 5th, or 5th, 6th. 



4th, 5th, or 5th, (itb. 



4th, 5th, or 4th, 6th, 6th. 



4th. 5th. 



4th, 6th. 



4th, .5th. 



4tb, 5th. 



4th, 5th, or 4th, 5th, 6th. 



4th, 5th. 



3rd, 4th, or 4th, 5th. 



4th or 0. 



4th or 5th. 



1. Coluber dichrous. 



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



occipitalis, Gi'mth. Ann. ^ Mag. N. H. (4) i. 1868, p. 420, and 



ix. 1872, p. 23. 

 Spilotes piceus, Cb;>e, Proc. Ac. Philad. 1868, p. 105, and Journ. Ac. 



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



Rostral broader than deep, visible from above ; iuternasals 

 broader than long, shorter than the pra^frontals ; 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 Hfth, 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. Veutrals 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 interiorly. 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,h. S (V. 166, 169; C. 98, 97). 

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



Bahia. 

 Pebas. 



d-e. <S (V. 161, 169; C. 94, 87). Pebas. 



Dr. 0. Wucherer [C.J. 

 Mr. liauxwell [C.J. 

 (Tvpe of H. occipitalis.) 

 Mr. E. Bartlett [C.]. 



