11. LACHESIS. 559 



h-m. c? (V. 155, 143, 149 ; Anamallays. Col. Beddome [0.1. 



C.68,63,55)& $(V.152, 



139; 0.47, 52). 

 «. Yg. (V. 145 ; C. 49). Nilgherries. Col. Beddome [C.]. 



0. S (V. 138 ; C. 44). Wyiiad. Col. Beddome [0.]. 



29. Lachesis trigonoceplialus. 



Coluter capite-triangulatus, LacSp. Serp. ii. pp. 112, 132, pi. v. fig. 2 



(1789). 

 Vipera trigonocephala, Daiid. Rept. Vi. p. 173 (1808). 

 Cophias trigonocephalus, Merr. Tent. p. 156 (1820). 



nigromarginatus, Kuhl, Beitr. p. 90 (1820). 



Trigonooephalua nigromarginatus, Schleg. Phys. Serp. ii. p. 641, 



pi. xix. figa. 14 & 15 (1837). 

 Megsera trigonocephala, Gray, Zool. MisceS. p. 49 (1842), and Cat. 



p. 12 (1849). 



olivacea. Gray, U. cc. 



Bothrops nigromarginatus, Dum. Sf Bibr. yii. p. 1516 (1854). 

 Trimeresurus trigonocephalus, Gunth. Bept. Brit. Ind. p. 390 (1864) ; 



Theob. Cat. Rept. Brit. Ind. p. 223 (1876) ; Bouleng. Faun. Ind., 



Rept. p. 431 (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 Tipper 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 miUim. ; tail 130. 



Ceylon. 



a-d. S (Sc. 17 ; V. 163 ; C. Ceylon. R. Templeton, Esq. 



60) & $ (Sc. 19, 17, 17 ; [P.]. 



V. 152, 149, 148; C. 53, 



58, 59). 

 e. 2 (Sc. 195 V. 163; C. 65). Ceylon. Capt. Gascoigne [P.]. 



/. Hgr. (Sc. 17; V. 149; C. Ceylon. B. H. Barnes, Esq. 



64). , [P.]. 



g-h. 2 (Sc. 19, 19 ; V. 146, Ceylon. Miss Layard [P.]. 



150; C. 56, 60). 

 i-k, I, m. 5 (Sc. 19, 19, 19 ; Ceylon. 



V. 147, 147, 152 ; C. 68, 



65, 66) & hgr. (Sc. 17 ; 



V. 147 ; C. 60). 



