538 VIPERID, 
Cophias atrox, Merr. Tent. p. 154 (1820). 
Bothrops megera, Wagl. in Spix, Serp. Bras. p. 50, pl. xix. (1824). 
—— tessellatus, Wagl. l. c. p. 54, 'e xxi. fig. 2. 
—— teniatus, Wagl. l.c. p. 55, pl. xxi. fig. 3. 
Craspedocephalus atrox, Fitsing. N. Class, Rept. p. 62 (1826) ; 
Wucherer, Proc. Zool. Soc. 1863, p. 51. 
me pat ate atrox, Schley. Phys. Serp. ii. p. 535, pl. xix. figs. & 
& 6 (18387). 
Crain lcneshiniag atrox, part., Gray, Cat. p. 6 (1849). 
Bothrops affinis, Gray, /. c. p. 7. 
—— atrox, part., Dum. § Bibr. vii. p. 1507 (1854); Giinth. Biol. 
C.-Am., Rept. p. 187 (1895). 
—— atrox, Jan, Arch. f. Nat. 1859, p.275; A. E. Brown, Proc, Ac. 
Philad. 1893, p. 434. 
Trigonocephalus asper, Garm. N. Am. Rept. p. 124 (1883). 
Snout obtusely pointed, with sharp, slightly raised canthus. 
Rostral as deep as broad or a little deeper than broad; nasal 
divided ; upper head-scales small, imbricate, more or less strongly 
keeled, in 5 to 9 longitudinal series between the supraoculars, which 
are large; a pair of large internasals, forming a suture with each 
other, and a large canthal; two postoculars and one, two, or three 
suboculars, separated from the labials by one series of scales; 
temporal scales keeled ; seven (rarely eight) upper labials, second. 
forming the anterior border of the loreal pit. Scales in 25 to 29 
rows, strongly keeled, the keels on the posterior part of the back 
very high, swollen in the middle, and much shorter than the scale. 
Ventrals 161-216; anal entire; subcaudals 47-73 pairs. Brown 
above, with more or less distinct dark, light-edged cross-bands 
or triangles with the apices approximating on the vertebral line; 
a more or less distinct dark streak from the eye to the angle of the 
mouth ; belly yellowish white, much speckled and blotched with 
brown, or brown spotted with yellowish white. 
Total length 1110 millim. ; tail 180. 
From Central America to Peru and Northern Brazil. 
a. ae (Sc. 25; V.216; Coban, Guatemala, — F. Sarg, Esq. (O.]. 
, 66). 
b.g (Sc. 25; V.201;C. 65). Matagalpa, Nicaragua. oH Rothschuh 
c. Yg. (Sc. 27; V. 197; Chontalez, Nicaragua. R.A. Rix, Esq. (C.]; 
0,40). ' Ww. Me’ Oneeton 
Nag Esq. [P-} ; 
d-e. § (Sc. 27; V. 202; Chiriqui. J.G, Champion, Esq. 
C. 72) & yg. (Sc. 27; [0-5 F. D. Godman, 
V. 195; C, 6b » 
sq. [P.]. 
t-g. Yg. (Sc. 29, 27; V. Carthagena, Colombia, Capt. bath [eae 
204, 190; CO, 62, 69). 
h-i. Yg. (Sc. 25, 27; V. Rosario du Cucuta, Mr. 0. Webber [C.]. 
210, 187 ; C. 77, 64). Colombia. 
k. ae. (Se. 27; V. 200; Bogota. . C. Laverde, Esq. [P.]. 
. 58). 
l-m. 2 (Sc. 26,27; V.196, W. Ecuador. Mr. Fraser [C.]. 
195; C. 65, 58). 
