274 COLUBRID, 
1. Helicops schistosus. 
Russell, Ind, Serp. ii. pl. iv. (1801). 
Coluber schistosus, Daud. Rept. Mars oT (1803). 
Pseudoeryx schistosus, Fitzing. N. 8. WAS 55 (1826), 
Tropidonotus dimidiatus, Bove, Isis, 1827, p. 535. 
schistosus, Schleg. Phys. Serp. ii. p. 319 (1837); Cantor, 
Cat. Mal. Rept. p. 91 (1847) ; Dum. § Bibr. vii. p. 596 (1854), 
—— moestus, Cantor, Proc, Zool. Soc, 1839, p. 54. 
surgens, Cantor, l. ¢. 
Tropidophis schistosus, oer Cat. p. 69 (1849). 
Atretium schistosum, Giinth. Rept. Brit. Ind. p. 278 (1864); Theob. 
Cat. Rept. Brit. Ind. p. 179 (1876). 
Helicops schistosus, Jan, Elenco, p. 76 (1863), and Icon, Gén, 
pl. il. fig. 8 (1868); Bouleng. Faun. Ind., Rept. p. 352 (1890). 
Atretium schistosum, var. yunnanensis, Anders, An. Zool. Res. 
Yunnan, p. 822 (1879). 
Eye moderate ; rostral just visible from above, forming a narrow 
suture with the internasal; frontal nearly twice as long as broad, 
much longer than its distance from the end of the snout, shorter 
than the parietals; loreal deeper than long; one preocular; two 
or three postoculars ; temporals 242; eight or nine upper labials, 
third and fourth or fourth and fifth entering the eye; four or five 
lower labials in contact with the anterior chin-shields, which are 
shorter than the posterior. Scales more or less distinctly keeled, in 
19 rows. Ventrals 129-151; anal divided; subcaudals 55-85, 
Olive-brown above, uniform or with two series of small black spots 
along the back ; a more or less distinct dark lateral streak; upper 
lip, outer row of scales, and lower surfaces yellowish. 
Total length 750 millim. ; tail 180. 
Southern India and Ceylon, Bengal, Burma, Yunnan, Mala 
Peninsula. 
a. 2 (V. 148; C. 68). India. Dr. P. Russell. 
b-d. 2 (V. 150,151,149; Madras. T. O. Jerdon, Esq. [P.]. 
C. 69, 53, ?). 
e-f,g. 3 (V. 129; C.67) | Wynad. . Col. Beddome [0.]. 
& yg. (V. 137, 134; C. 
55, 56). 
h. Yg. (V. 182; C. 74). Anamallays. Col. Beddome [C.]. 
a. 9 (V. 140; C. 67). Ceylon. R. Templeton, Esq. [P.]. | 
k. 2 (V. 142; C. 67). Ceylon. Sir E. Tennent Ph. 
iL-m. g (V. 139, 138; Ceylon. m2 58 
C. 85, 82). 
n. gd (V. 136; C. 77). Pinang. Dr. Cantor. 
2. Helicops bicolor. 
Limnophis bicolor, Giinth. Ann. § Mag. N. H. (3) xv. 1865, p. 96, 
pil. il. fig. C; Bocage, Jorn. Se. Lish. i, 1866, p. 68; Steindachn. 
ovara, Rept. p. 67 (1869). 
Eye moderate ; rostral just visible from above, forming a narrow 
suture with the internasal ; frontal nearly twice as long as broad, — 
as long as or longer than its distance from the end of the snout, 
