30 COLUBRID. 
II. American species. 
| 
Se. ¥. A. 0. Labials entering eye. 
Qichrous.............:.| 15 161-176 1 87-101 | 4th, 5th, or 3rd, 4th, 5th. 
(CTT Geese ae 17 184-215 1 53-83 | 3rd, 4th, or 4th, 5th. 
nove-hispanie ...... 19 204-222 | 1 | 115-188 | 4th, 5th. 
melanotropis ......... 17 152 2 94 4th, 5th, 6th. 
IMUSTAS vice ce canes ace 31-35 | 243-282 | 2 91-119 | 4th, 5th, or 5th, 6th. 
Chlorosoma.........00: 33 247-260 | 2 | 107-112 | 4th, 5th, or 5th, 6th. 
FULOUTUTUS <6... 0.0005 27-33 | 252-266 | 2 | 102-119 | 4th, 5th, or 4th, 5th, 6th. 
OTITIS SOE EE RS 25-31 | 200-239 2 60-88 4th, 5th. 
VUUPINUS 6... .0000e- 23-27 | 200-234 | 2 67-85 | 4th, 5th. 
TALS) Saar nsercce 25-29 | 220-240 | 2 72-81 | 4th, 5th. 
DOSHLELUS S250 touicaee ener 95-89 | 217-245} 2 72-93 | 4th, 5th. 
lineuticollis ......... 27 244 1 69 4th, 5th, or 4th, 5th, 6th. 
GIIZOIME ks sscccescs 27-31 | 212-297 | 1 46-59 | 4th, 5th. 
DED recess. 2scs- ee 27-29 | 209-233 | 1 51-67 | 3rd, 4th, or 4th, 5th. 
COLENUF ER. So. ce ecvasses 29-35 | 204-245; 1 66-72 | 4th or 0. 
A ioucls epee ccaes 29-35 | 209-239 | 1 45-65 | 4th or 5th. 
1. Coluber dichrous. 
Herpetodryas dichroa, Peters, Mon. Berl. Ac. 1863, p. 284. 
occipitalis, 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 prefrontals ; 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 pre- and two postoculars; temporals 242, 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 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 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. 5 (V. 166, 169; C. 98,97). Bahia. Dr. O. Wucherer [C.]. 
¢. Yg. (V.175; .C, 26): Pebas, Mr. Hauxwell [C.]. 
(Type of ZZ. oceipitalis, ) 
d-e. 3 (V. 161, 169; C. 94, 87). Pebas. Mr. E. Bartlett (C.]. 
