544 viPBRiD-ai. 



11. Lachesis casteluaudi. 



Botlirops castelnaudi, Bum. ^ Bibr. vii. p. 1511 (1854) ; Guichen. in 



Casteln. Anim. Nouv. Amer. Sud, Rept. p. 75, pi. xv. (1855) ;. 



Steind. Sitzb. Ah. Wien, Ixii. i. 1870, p. 349. 

 Atropos castelnautii, Bum. ^ Bibr. ix. p. 388 (1854). 

 Triffonocephalus castelnaudi, Jan, Rev. Sf Mag. Zool. 1859, p, 155. 

 Bothriechis castelnaui, Cope, Proc. Ac. Philad. 1860, p. 345. 

 Bothriopsis quadrisoutatus, Peters, Man. Berl. Ac. 1861, p. 359 ; 



R. Blanch. Bull. Soc. Zool. France, 1889, p. 348. 



castelnavii, Cope, Proc. Ac. Philad. 1871, p. 209. 



Thanatopliis castelnaudi, Posada-Arango, Bull. Soc. Zool. France, 



1889, p. 343. 

 ? Thanatophis montanus, Posada- Arango, I. c. p. 344. 



Head narrow and elongate ; snout rounded, with well-marked 

 canthus. Eostral as deep as broad ; nasal divided ; upper head- 

 scales small, juxtaposed, smooth or feebly keeled on the snout and 

 vertex ; supraoculars 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. <S (Sc. 27 ; V. 246 ; Moyobamba, Peru. Mr. A. H. Koff [C.]. 



b-c. Yg. (Sc. 26, 27 ; V. Sarayacu, Ecuador. Mr. C. Buckley [0.1. 

 243, 230 ; 0. 83, 73). 



12. Lachesis nummifer. 



Atropos nummifer, Rupp. Verz. Sench. Miis., Amph. p. 21 (1845). 

 Lachesis mutus, part., Gray, Cat. p. 13 (1849). 

 Atropos mexicanus, Bum. Sr Bibr. vii. p. 1521, pi. Ixxxiii. b. (1854). 

 Teleuraspis nummifer, Cope, Proc. Ac. Philad. 1859, p. 339 ; Oiinth. 



Ann. I Mag. N. H. (3) xi. 1863, p. 25, pi. iii. fig. 0. 

 Trigonocephalus nummifer, Jan, Rev. Sf Mag. Zool. 1859, p. 155. 

 Bothriechis nummifera. Cope, Proc. Ac. Philad. 1860, p. 345 ; Oiinth. 



Biol. C.-Am., Rept. p. 191 (1895). 



mexicanus. Cope, Proc. Ac. Philad. 1861, p. 294. 



Bothrops nummifer, Jan, Elenco, p. 126 (1863), and Icon. Gin. 47, 



pi. V. fig. 2 (1875). 



afiinis, Bocourt, Ann. Sc. Nat. (5) x. 1868, p. 201. 



Bothriopsis aifinis. Cope, Proc. Ac. Philad. 1871, p. 209. 



mexicanus, Cope, I. c. 



Bothriechis nummifera, var. notata, Fisch. Arch.f. Nat. 1880, p. 222, 



pi. viii. figs. 10-12. 



