1 AS Va 
v! 
534 VIPERID A. 
1. Lachesis mutus. 
Seba, Thes. ii. pl. Ixxvi. fig. 1 (1735). 
Crotalus mutus, Linn. S. N. i. p. 873 (1766); Schleg. Phys. Serp. ii- 
p- 570, pl. xx. figs. wi ete (1837). 
Boa muta, Lacép. il pp. {98 & 389 (1789). 
Coluber crotalinus, N. i. p. 1094 (1789) ; Shaw, Zool. iii- 
p- 400 (1802). 
—— alecto, Shaw, 1. c. p. 405. 
Scytale catenata, Latr. Rept. iii. p. 162 (1802). 
—— ammodytes, Latr. t.c. p. 1 Pend Beep 947 800) 
Lachesis mutus, ae +i. 351; ips C Bs oe! 
1854); Garm. N. Am. Rept. 1883) ; wide! Leone 
en. Serp. Brés. p. 5 (1884); ‘ Giinth. Biol. C.-Am., Rept. p. 188 
(1895). 
Tt onocephalus ammodytes, Oppel, Ordn. Rept. p. 66 (1811). 
Cophias aaaaee, Merr. Tent. P. 154 (1820). - ) 
Bothrops surucucu, Wagl. in Spx, Serp. Bras. p. be xxiii, (1824), 
Lachesis rhombeata, Wied, Abbild. Nat. Bras. ( 
Craspedocephalus crotalinus, Gray, Ann. Philos 1825, p. 205. 
Lachesis mutus, part., Gray, Cat. p. 18 (1849). 
—— stenophrys, Cope, Journ. Ac, Philad. (2) viii. 1876, p. 152. 
Rostral as deep as broad or a little broader than deep; nasal 
divided ; upper head-scales very small, granular, smooth or obtusely 
keeled; supraocular narrow; two or three scales separating the 
internasals in front; 10 to 15 scales on a line between the supra- 
oculars ; four or five series of scales between the eye and the upper 
labials ; temporal scales obtusely keeled; 9 or 10 upper labials, 
second usually forming the anterior border of the loreal pit, third very 
large. Scales tubercularly keeled, feebly imbricate, in 35 or 37 rows. 
Ventrals 200-230 ; anal entire; subcaudals 32-50, all or greater 
part in pairs and followed by very small keeled scales covering the 
end of the tail. Yellowish or pinkish above, with a series of large 
rhomboidal dark brown or black spots enclosing smaller light spots ; 
a black streak from the eye to the angle of the mouth. 
Total length 1995 millim.; tail 170. 
Central and Tropical South America. 
(Se. 37, 35; Panama. 
y. 008 206; ©. 36, 87), 
¢. é (Se, 37; ¥. 226 ; Demerara ? Col, E. Sabine [P.]. 
. 36), 
d, oe , head and tail Surinam. C. Pj Ellascombe, Esq. 
. 86). }. 
é. o on 35; V. 223; Pernambuco. W. A. Forbes, Esq. [P.]. 
f. é ( c. 85; V. 225; Bahia. Dr. O, Wucherer [C.]. 
. 84). 
g. Ad., stffd. Brazil. ae Parker [P.]. 
h. Q (Sc. 35; V. 225; Onyerie, N.E. Mr. W. Davis Py 
C, 36). eru, Messrs. Veitch [P.] 
i. & (Sc. 85; V. 226; Bolivia. M, Suarez [P.]. 
. 35). 
