282 COITBEIBiE. 



1. Tretanorhinus variabilis. 



Tretanorhinus Yariabills, part., Bum. ^ Bihr. vii. p. 349, pi. Ixxx, 



fig. 4 (1854) ; Jan, Arch. Xool. Anat. Fhys. iii. 1865, p. 254 ; 



Gundlach, Erp. Cub. p. 80 (1880). 

 Tropidonotus cubanus, Gundlach, Mon. Berl. Ac. 1861, p. 1001, and 



I. c. p. 81. 

 Tretanorhiaus variabilis, Cope, Proc. Ac. Philad. 1861, p. 298, and 



1868, p. 300 ; Bocourt, Le Natur. 1891, p. 122. 

 Helicops wagleri, Jan, I. c. p. 247, and Icon. Gen. 28, pi. i. fig. 1 



(1868). 

 Tretanorhinus variabilis, var. adnexus, Jan, I. c. ; Bocourt, I. c. p. 208. 

 Helicops variabilis, part., Gannan, N. Am. Kept. p. 33 (1883). 



Head narrow and elongate ; eye rather small ; nasals in contact 

 ■with each other behind the rostral, or narrov^ly separated ; inter- 

 nasals small, longer than broad ; frontal as long as its distance 

 from the end of the snout, shorter than the parietals ; ioreal 

 elongate; one or two pree- and two postoculars ; temporals 1 + 2;. 

 eight upper labials, fourth entering the eye : four or five lower 

 labials in contact with the anterior chin-shields ; posterior chin- 

 shields a little longer than the anterior and separated from each 

 other by scales. Scales in 19 rows, keeled, the keels strongest on 

 the tail, Ventrals 131-164 ; anal divided ; subeaudals 50-78- 

 Olive or blackish above, with or without blackish cross bands ; a 

 more or less distinct light lateral streak on the second and third, 

 rows of scales ; a dark .streak on each side of the head, passing 

 through the eye ; belly orange or red, dotted or spotted all over' 

 with brown, or brown dotted with paler. 



Total length 660 millim ; taU 160. 



Cuba. 



a-b. c? (V. 160, 158 ; C. 69, 68). Cuba. 



c. 3 (V. 155; 0. 68). Cuba. Prof. Peters fP-l- 



2. Tretanorhinus nigroluteus. 



■1 /(-T--, iR,-v-v.v. *1 



Tretanorhinus variabilis, part.. Bum. ^- Bibr. vii. p. 349 (1854) y. 



Jan, Arch. Zool. Anat. Phys. iii. 1865, p. 254. 

 nigroluteus, Co2>e, Proc. Ac. Philad. 1861, p. 298, and 1868, 



p. 309 ; Giinth. Ann. ^_ Mag. N. H. (4) ix. 1872, p. 27 ; Cope, 



Proc. Am. Philos. Soc. xxii. 1885, p. 183 ; Bocourt, Le Natur. 1891, 



p. 122. 

 Helicops agassizii, Jan, I. a. p. 248, and Icon. G4n. p. 28, pi. ii. fig. 1 



(1868). 



■ ■ variabilis, part., Garman, N. Am. Pept. p. 33 (1883). 



nigroluteus. Garni. I. c. p. 144. 



bifrenatus, Bocourt, Bull. Soc. Philom. (7) viii. 1884, p. 194. 



Eegina nigrolutea, Cope, Bidl. U.S. Nat. Mus. no. 32, 1887, p. 74. 

 Tretanorhinus lateralis, Bocourt, I. c. 



Very closely allied to the preceding, but differing in the following 

 points: — Usually two loreals, anterior smallest; two or three' 

 praeooulars ; posterior chin-shields in contact with each other 

 anteriorly ; scales in 21 rows. . Oliye or blackish above, uniform or' 



