542 VIPERID 2. 
8. Lachesis neuwiedii. 
Bothrops neuwiedi, Wagl. in Spix, Serp. Bras. p. 56, pl. xxii. fig. 1 
(1824); Jan, Arch. f. Nat. 1859, p. 275. 
—— leucurus, Wag]. l. c. fig. 2. 
ie beni “red neuwiedii, Jan, Rev. § Mag. Zool. 1859, p. 154. 
Bothrops diporus, Cope, Proc, Ac. Philad. 1862, p. 34? ; Boettg. 
Zeuschr. ges. Naturw, lviii. 1885, p. 289; Bouleng. Ann. §& Mag. 
N. H. (5) xviii. 1886, p. 488. 
atrox, part., Hensel, Arch. f. Nat. 1868, x 334, 
Trigonocephalus ere pubescens, Cope, Proc. Amer. Philos. Soc. 
xi. 1869, p. 157. 
Bothrops aaa Lacerda, =» 4 Ven, Serp. Brés. p. 11, pl. i. (1884). 
—— atrox meridionalis, F. Miill. Verh. Nat. Ges. Basel, vii. 1885, 
p- 699. 
Snout obtusely pointed, with strong, slightly raised canthus. 
Rostral as deep as broad ; nasal divided ; upper head-scales small, 
imbricate, strongly keeled, largest on the snout; supraocular large, 
separated from its fellow by 6 to 9 longitudinal series of scales ; 
internasals large and in contact with each other; a large canthal; 
two or three postoculars and a subocular, which is separated from 
the labials by two or three series of scales ; loreal pit separated 
from the labials; temporal scales keeled; 8 or 9 upper labials. 
Scales very strongly keeled, in 21-27 rows. Ventrals 168-182; 
anal entire; subcaudals 41-53. Yellowish or pale brown above, 
with dark brown, black-edged spots ; the spots on the back forming 
a single series or a double alternating series; a lateral series of 
small spots; a dark spot on the snout, a pair of dark bands from 
the vertex to the nape, and another from the eye to the angle of the 
mouth ; all these markings may have a fine yellow edge ; yellowish 
beneath, more or less profusely dotted or powdered with brown and 
largely spotted on the sides. 
Total length 770 millim. ; tail 120. 
Brazil, Paraguay, Argentina. 
a-b, c-f. 3 (Sc. 25, 25; S.Lorenzo,RioGrande Dr.H.v. Ihering [C.}. 
V. 171,176; ©.50,50), do Sul. 
2 (Sc. 25; V. 169; ©. 
47), & yg. (Sc. 25, 25, 
97; V.'173, 182, 170; 
9 '(Be 2D; V.1775 As Paraguay. Dr. J. Bohls [C 
g-h. 2 (Sc. 25; V. ; uncion, ay. r. J. oh 
C.41) & hgr. (Se. 27; ‘ (0 
V. 179; 0. 47). Seen 
-k. fg (Sc. 21; V. ; Paraguay. 
C. 58) & 2 (Sc. 25; . 
V. 177; ©. 41). 
l. g (8c. 25; V. 176; Cordoba. E. W. White, Esq. 
C, 47). [C.}. 
as | 
