552 VIPERID. 
being constant; belly yellow, more or less profusely spotted or 
marbled with black. 
Total length 930 millim. ; tail 145. 
Khasi hills, Assam ; Tibet ; Upper Yang-Tse-Kiang. 
a~c. ¢ (Sc. 21, 21; V. 175, Khasihills. — T.C. Jerdon, Esq. [P.]. 
173; CO, 66, 58) & (Type.) 
d. 2 (Se. b1; Vv, 175; ‘C54). Khasi hills, Col. geil 
e-t. ¢ (Se. 22, 21; v. 183, Ichang. A. E. Pratt, thea. ah 
180; C. 67, 63) & 9 _(ypes of 7 eantho me. 
(Sc. 21, 21, 21; V. 186, 
187, 185; C. 58, 60, 55). 
k. 3 (Se. 2] ¥, 188 ; C, 54). Kia-tiang-fu, A. E. Pratt, Esq. [C.]. 
Prov. Sze- 
Chuen, 1070 ft. 
22. Lachesis mucrosquamatus. . 
Trigonocephalus mucrosquamatus, Cantor, Proc. Zool. Soc, 1889, 
32. 
Cipaapediceishiking elegans, Gray, Cat. 7 (1849). 
Trimeresurus mucrosquamatus, Giinth. Rept. Brit Ind. p. 390 (1864) ; 
Swinhoe, Proc. Zool. Soc. 1870, p. 411, pl. xxxi. ; Theob. Cat. Rept. 
Brit. Ind. p. 224 (1876) ; Fischer, Jahrb. Hamb. Wiss. Anst. vy. 
1888, p. 21; Bouleng. Faun. Ind. , Rept. p. 428 (1890). 
Rostral slightly broader than deep ; nasal divided or semidivided ; 
upper head-seales extremely small, granular, smooth or obtusely 
keeled ; supraocular large, or rather narrow; 2 or 3 scales sepa- 
rating the internasals in front; 10 to 15 scales on a line between 
the supraoculars ; three to five minute postoculars and a subocular, 
which is separated from the labials by one, two, or three series of 
scales ; temporal scales smooth ; 7 to 11 upper labials, second form- 
ing the anterior border of the loreal pit. Scales strongly keeled, in 
25 or 27 rows. Ventrals 183-218; anal entire; subcaudals 72-92 
pairs. Brownish grey above, with a dorsal series of large blackish 
spots and a lateral series of smaller ones; a blackish streak from 
the eye to the angle of the mouth; lower parts brownish, spotted 
with white. 
Total length 1050 millim.; tail 210. 
Formosa; Naga hills, Assam. 
g (Se. 25; V. 200;  Takow, Formosa. _ R. Swinhoe, Esq. [C.]. 
b. 8 ‘ie 27; V.214; Formosa, R. Swinhoe, Esq. [C.]. 
ce. 6 fol" 27; V.211; OC. Formosa, Mr. Holst [C.]. 
d. ak = 27; V.210; 8. Formosa, Dr. J. G. Fischer. 
é, i 3 (Sc. 25; V.187; ——P Sir E. Belcher [P.}. 
76 Sc. 25; 
aia 
