544 VIPERID 2. 
11. Lachesis castelnaudi. 
Bothrops castelnaudi, Dum. § Bibr. vii. p. 1511 (1854); Gutchen, in 
Casteln. Anim. Nouv. Amér. Sud, Rept. p- 75, pl. xv. (1855) ; 
Steind. Sitzb. Ak. Wien, Ixii. i. 1870, p. 349. 
Atropos castelnautii, Dum. § Bibr. ix. p. 888 (1854). 
is bags naoer castelnaudi, Jan, Rev. § Mag. Zool, 1859, p, 155. 
Bothriechis castelnaui, Cope, Proc. Ac. Philad, 1860, p. 345, 
Re ee Peters, Mon. Berl. Ac, 1861, p. 359; 
R. B . Bull. Soc. Zool. France, 1889, p. 348. 
castelnavii, Cope, Proc. Ac. Philad, 1871, p. 209. 
Tar Sa aoe Posada-Arango, Bull. Soc. Zool. France, 
1889, p. 343. 
P Thanstophis montanus, Posada-Arango, l. c. p. 344. 
Head narrow and elongate; snout rounded, with well-marked 
canthus. Rostral as deep as broad; nasal divided; upper head- 
scales small, juxtaposed, smooth or feebly keeled on the snout and 
vertex ; supracculars very large, separated by five longitudinal 
series of scales; a pair of large internasals, in contact with each 
other, and a large canthal; two or three postoculars and a sub- 
ocular, separated from the labials by one series of scales; temporal 
scales keeled; 7 upper labials, second forming the anterior border 
of the loreal pit. Scales strongly keeled, in 25 or 27 rows. Ven- 
trals 230-253 ; anal entire; subcaudals 72-83, all or greater part 
single. Greyish or brown above, with dark or light-edged cross- 
bands or transverse series of spots ; head above with dark spots, one 
of which occupies the middle of the snout; a dark band from the 
eye to the angle of the mouth; belly brown or blackish, speckled 
and spotted with yellow. 
Total length 1220 millim. ; tail 180. 
Brazil, Ecuador, Eastern Peru. 
a. e (Sc. 27; V. 246; Moyobamba, Peru. Mr. A. H. Roff [C.}. 
. 81). 
b-e. Yg. (Sc. 25,27; V. Sarayacu, Ecuador. Mr, C. Buckley [C.]. 
248, 230; 0. 83, 78). 
12. Lachesis nummifer. 
Atropos nummifer, rg Verz. Senck. Mus., Amph. p. 21 (1845). 
Lachesis mutus, part., Gray, Cat. p. 13 (1849). 
Atropos mexicanus, Dum. § Bibr, vii. p. 1521, pl. Ixxxiii. b, (1854), 
Teleuraspis nummifer, Cope, Proc. Ac. Philad. 1859, p. 839; Giinth. 
Ann. & Mag. N. H. (3) xi. 1863, p. 25, pl. iii. fig. OC. 
Trigonocephalus nummifer, Jan, Rev. §& Mag. Zool. 1859, p. 155. 
Bothriechts nummifera, Cope, Proc, Ac, Philad. 1860, p. 345; Giinth. 
Biol. C.-Am., Rept. p. 191 (1895). 
—— mexicanus, Cope, Proc. Ac. Philad. 1861, p. 294. 
Bothrops nummifer, Jan, Elenco, p. 126 (1863), and Icon. Gén. 47, 
pl. v. fig. 2 (1875). 
—— affinis, Bocourt, Ann. Sc, Nat, (5) x, 1868, p. 201. 
Bothriopsis affinis, Cope, Proc, Ae, Philad, 1871, p. 209. 
—— mexicanus, A Le. 
Bothriechis nummifera, var. notata, Fisch. Arch. f. Nat. 1880, p. 222, 
pl. viii. figs, 10-12, 
