A. First infralabial scale in contact with its fellow.
I. Scales in 21-25 (rarely 27) rows; 129-158 ventrals; 21-57 subcaudals; 5-9 series of scales between the supraocular shields; tail non-prehensile.
Fig. 32.—Lachesis okinavensis. (After G. A. Boulenger, op. cit.)
(1) L. monticola.—Supraocular shields large, separated by 5-8 scales; snout obtuse.
Colour brown or yellowish above, brown or pale yellow on the sides, with a brown temporal streak. Belly white, spotted with brown.
Total length, 740 millimetres; tail 115.
Habitat: Tibet, Himalayas (2,000 to 8,000 feet), Hills of Assam, Burma, Malay Peninsula, Singapore, Sumatra.
(2) L. okinavensis ([fig. 32]).—Supraocular shields large, separated by a transverse series of 6-9 scales; end of snout pointed and turned up.
Colour brown above, with dark transverse bands and a light temporal streak. Belly brown, spotted with black, especially on the sides.