11. LACHESIS. 5a9 
h-m. & (V. 155, 148,149; — Anamallays. Col. Beddome [C.]. 
C. 58,53, 55) & 9(V. 152, | 
139; ©. 47, 52). , 
n. Yg. (V. 145; C. 49). Nilgherries. Col. Beddome [C.]. 
o. 2 (V. 188; C. 44). Wynad. Col. Beddome od 
29. Lachesis trigonocephalus. 
Coluber capite-triangulatus, Lacép. Serp. ii. pp. 112, 182, pl. v. fig. 2 
1789). 
Vipers trigonocephala, Daud, Rept. vi. p. 178 (1893). 
Cophias trigonocephalus, Merr. Tent. p. 156 (1820). 
nigromarginatus, Kuhl, Beitr. p. 90 (1820). 
Trigonocephalus nigromarginatus, Schleg. Phys. Serp. ii. p. 541, 
pl. xix. figs. 14 & 15 (1837). 
Megwera trigonocephala, Gray, Zool. Miscell. p. 49 (1842), and Cat. 
p. 12 (1849). 
olivacea, Gray, Il. ce. 
Bothrops nigromarginatus, Dum. § Bibr. vii. p. 1515 (1854). 
Trimeresurus trigonocephalus, Giinth. Rept. Brit. Ind. p.390 (1864) ; 
Theob. Cat. Rept. Brit. Ind. p. 223 (1876); Bouleng. Faun. Ind., 
Rept. p. 481 (1890) ; Boettg. Ber. Offenb. Ver. Nat. 1892, p. 93. 
Snout very short. Rostral broader than deep; nasal entire or 
semidivided; upper head-scales smooth, imbricate; internasals 
large, in contact with each other, sometimes fused to one shield ; 
supraocular large, divided into two; 4 to 6 scales in a transverse 
series between the supraoculars ; two or three small postoculars and 
a subocular, the latter shield usually separated from the labials by 
one series of scales; 9 or 10 upper labials, second forming the 
anterior border of the loreal pit. Scales smooth or faintly keeled, 
in 17 or 19 rows. Ventrals 145-170, the last notched or divided 
into two; anal entire; subcaudals 53-67 pairs. Tail prehensile. 
Green above, uniform or with black markings, which may form 
wavy dorsal bands; a black temporal streak ; upper surface of head 
with or without a network of black bands; ventrals yellowish, 
uniform or green at the base; end of tail usually black. 
Total length 790 millim.; tail 130. 
Ceylon. 
a-d. § (Se. 17; V. 153; C. Ceylon. R. Templeton, Esq. 
60) & 2 (Se, 19, 17,17; [P.]. 
V. 152, 149, 148; C. 53, 
58, 59). 
e. 2 (Sc. 19; V. 153; C. 55). Ceylon. Capt. Gascoigne [P.]. 
f. Hgr. (Se. 17; V. 149; C. Ceylon. B. D3 Barnes, Esq. 
54). P.). 
g-h. 2 (Se. 19, 19; V. 146, Ceylon. les Layard [P.]. 
150; C. 55, 60). 
i-k, l,m. 2 (Se. 19, 19, 19; Ceylon. 
V. 147, 147, 152; C. 58, 
55, 56) & hgr. (Se. 17; 
V. 147; C. 60). 
