Trimeresurus jerdonii, illustration by G.H. Ford (1875) for Günther's original description.
Males grow to a maximum total length of 835 mm (32.9 in), with a tail length of 140 mm (5.5 in); females to 990 mm (39 in), with a tail length of 160 mm (6.3 in).
Scalation: dorsal scales in 21 longitudinal rows at midbody (rarely 23); snout length a little more than twice diameter of eye; head above, except for large internasals and supraoculars, covered by small, unequal, smooth scales that are feebly imbricate or juxtaposed; first labial completely separated from nasal scales by a suture; internasals separated by 1-2 small scales; 6-9 small scales in line between supraoculars; 7-8 upper labials, third and fourth beneath eye, in contact with subocular or separated by at most a single series of small scales; ventrals: males 164-188, females 167-193; subcaudals: males 50-78, females 44-76.
^ abMcDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).