160 COLUBRID®. 
4, Aporophis amenus. 
Enicognathus ameenus, Jan, Arch. Zool. Anat, Phys. ii. 1863, p. 270, 
and Icon, Gén. 16, pl. ii. fig. 1 (1866). 
Rostral broader than deep, just visible from above; internasals 
nearly as long as broad, a little shorter than the prefrontals ; 
frontal twice as long as broad, considerably longer than its distance 
from the end of the snout, as long as the parietals ; loreal a little 
deeper than long ; one pree- and two postoculars ; temporals 1+2 ; 
eight upper labials, fourth and fifth (or third, fourth, and fifth) 
entering the eye ; four lower labials in contact with the anterior 
chin-shields, which are shorter than the posterior. Scales in 17 
rows. Ventrals 137-143; anal divided; subcaudals 92-94. 
Olive-brown above, with a blackish vertebral line, which is indis- 
tinct or absent on the anterior half of the body: two outer rows of 
scales grey-brown, third row black, with a round white spot in the 
centre of each scale; a black streak on each side of the head, 
passing through the eye; upper lip white; lower parts white, with 
a lateral series of black dots. 
Total length 590 millim.; tail 210. The specimen in the 
collection measures 235, tail 75. 
Brazil. 
a. Yg. (V. 187; C. 92). Theresopolis, Prov. Rio Dr. E. A. Géldi [P.]. 
Janeiro. 
81. RHADINZA. 
Liophis, part., Wagl. Syst. Amph. p. 187 (1880) ; Dum. & Bibr. Erp. 
Gén. vii. p. 697 (1854); Giinth. Cat. Col. Sn. p. 42 (1858); Jan, 
Arch. Zool. Anat. Phys. ii. 1863, p. 287. 
Coronella, part., Schleg. Phys. Serp. ii. p. 50 (1837) ; Giinth. 1. e. 
p: 84; Jan, l. c. p. 236. 
Dromicus, part., Dum. § Bibr. t. c. p. 646; Giinth. 1. ce. p. 126; 
Cope, Proce. Ac. Philad. 1862, p. 76; Jan, Elenco sist. Ofid. p. 66 
(1863) ; Bocourt, Miss. Sc. Mex., Rept. p. 707 (1890). 
Ophiomorphus (non Dej.), Cope, l. ce. p. 75, and Proc, U.S, Nat. 
Mus. xii. 1889, p. 144. 
Lygophis (non T'sch.), part., Cope, l. e. 
Rhadinza, Cope, Proc. Ac. Philad. 1863, p. 100, and 1868, p. 132. 
Calonotus (non Hiibn.), Jan, l. ¢. p. 259. 
Diadophis, part., Jan, /. ¢. p. 261; Bocourt, Miss. Se. Mex., Rept. 
p- 618 (1886). 
Enicognathus, part., Jan, l. c. p. 266; Bocourt, 1. e. p. 625. 
Ablabes, Jan, 7. c. d: 279. 
Aporophis, part., Cope, Proc. Am. Philos, Soc. xvii. 1877, p. 34. 
Maxillary teeth 14 to 24, posterior largest, forming an uninterrupted 
series, or the two or three hindermost separated from the others 
by a very short interspace; mandibular teeth subequal. Head but 
slightly distinct from neck; eye moderate or rather small, with 
round pupil. Body cylindrical ; scales smooth, without apical pits, 
