160 COLUBKIB^. 



4. Aporophis amoenus. 



Enicognathus amoenus, Jan, Arch. Zool. Anat. Phi/s. ii. 1863, p. 270, 

 and Icon. Gen. 16, pi. ii. fig. 1 (1866). 



Rostral broader than deep, just visible from above ; internasals 

 nearly as long as broad, a little shorter than the praefrontals ; 

 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 pra3- 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. 137 ; C. 92). Theresopolis, Prov. Rio Dr. E. A. C46ldi [P.]. 

 Janeiro. 



81. RHADIN^A. 



Liophis, part., Wagl St/.st. Amph. p. 187 (18.30) ; Dum. ^- Bibr. Erp. 



Gen. vii. p. 697 (1854) ; Giinth. Cat. Col. Sn. p. 42 (1858) : Jan, 



Arch. Zool. Anat. Phys. ii. 1863, p. 287. 

 Coronella, part., Schlec/. Phys. Serp. ii. p. 50 (1837) ; Giinth. I. c. 



p. 34 ; Jan, I. c. p. 236. 

 Dromicus, part., Dum. S) Bibr. t. e. p. 646; Giinth. I. c. p. 126; 



Cope, Pruc. Ac. Philad. 1862, p. 76 ; Jan, Elenco sist. Ofid. p. 66 



(1863) ; Bocourf, Miss. Sc. Me.v., Pept. p. 707 (1890). 

 Ophiomorphus (non DeJ.), Cope, I. c. p. 75, and Proc. U.S. Nat. 



Mus. xii. 1889, p. 144. 

 Lygophis (non Tsch.), part., Cope, 1. c. 



Rhadinc-ea, Cope, Proc. Ac. Philad. 1863, p. 100, and 1868, p. 132. 

 Calonotus (non Hiibn.), Jan, I. c. p. 239. 

 Diadophis, part., Jan, I. c. p. 261; Bocourt, Miss. Sc. Me.v., Rept. 



p. 618 (1886). 

 Enicognathus, part., Jan, I. c. p. 266 ; Bocourt, I. c. p. 625. 

 Ablabes, Jayi, I. c. p. 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, 



