276 COLUBRID. 
5. Helicops trivittatus. (Prare XVITL. fig. 2.) 
Myron trivittatus, Gray, Cat. p. 70 (1849). 
Eye small. Rostral much broader than deep, visible from 
above ; nasals usually in contact behind the rostral; frontal about 
twice as long as broad, as long as its distance from the end of the 
snout, shorter than the parietals ; loreal deeper than long; two pra- 
and two or three postoculars ; temporals 1+2; eight upper labials, 
fourth entering the eye; five lower labials in contact with the an- 
terior chin-shields, which are nearly as long as the posterior. Scales. 
faintly keeled, in 21 or 23 rows. Ventrals 120-130; anal divided ; 
subcaudals 638-65. Coloration very much as in Abastor erythro- 
grammus. Dark olive above, with small black spots and five yel- 
lowish or reddish longitudinal streaks, outer widest ; belly yellow or 
orange, with two regular longitudinal series of subcrescentic trans— 
verse black spots. 
Total length 670 millim. ; tail 190. 
Brazil. ; 
a. 9 (V. 126; C. 63). —? Zoological Society. (Type.) 
b. & (V. 120; C.?). ——? Zoological Society. 
c-d. Yg. (V. 130, 129; Para. R. Graham, Esq. [P.]. 
C. 65, 65). 
6. Helicops carinicauda. 
Coluber carinicaudus, Wied, Beitr. Nat. Bras. i. p. 800 (1825), and 
Abbild. (1825). 
Helicops carinicaudus, Wagl. Icon. Amph. pl. vii. (1828); Dum. & 
Bibr. vii. p. 744 (1854) ; Jan, Arch. Zool. Anat. Phys. iii. 1865, 
ae Hensel, Arch. f. Nat. 1868, p.329 ; Bouleng. Ann. § Mag 
. H, (5) xvi. 1885, p. 297, and xviii. 1886, p. 435. 
Homalopsis carinicaudus, Schleg. Phys, Serp. ii. p. 350, pl. xiii 
figs. 17 & 18 (1837). 
Helicops carinicaudus, var. gastrosticta, Jan, I. ¢. 
infrateeniatus, Jan, Arch. Zool. Anat. Phys. iii. 1865, p. 245, and 
Icon. Gén, 28, pl. iii. fig. 3 (1868); Cope, Proc. Am. Pritos. Soc. 
xxii, 1885, p. 193. 
—— trivittatus, Cope, Proc. Am. Philos. Soc. xvii. 1877, p. 92. 
—— baliogaster, Cope, Proc. Am. Philos. Soc. xxii. 1885, p. 198. 
Eye small; rostral visible from above, forming a narrow suture 
with the internasal; frontal twice as long as broad, widening pos- 
teriorly, much longer than its distance from the end of the snout, 
as long as or a little shorter than the 'parietals ; loreal deeper than 
long (rarely absent) ; one pree- and two postoculars ; temporals 14+2 
or 242; seven or eight upper labials, third or fourth (rarely third 
and fourth) entering the eye; four or five lower labials in contact 
with the anterior chin-shields, which are as long as or a little 
shorter than the posterior. Scales in 19 rows, feebly keeled 
anteriorly, strongly keeled on the posterior part of the body and on | 
the tail; outer scales smooth. Ventrals 126-155; anal divided; - 
