540 VIPERID 2. 
5. Lachesis microphthalmus. 
eT microphthalmus, Cope, Jowrn. Ac. Philad. (2) viii. 1876, 
p- . 
Snout short, rounded, with distinct canthus; eye very small. 
Rostral slightly deeper than broad; nasal divided; upper head- 
scales imbricate, smooth or obtusely keeled on the snout and vertex ; 
supraoculars large, separated in the middle by five or six series of 
scales ; scales on back of head smaller, with a short keel (or smooth) ; 
loreal pit separated from the labials; 7 upper labials, third and 
sixth or seventh largest. Scales in 23 rows; dorsals tubercularly 
keeled, the keel not reaching the extremity of the scales and 
terminating in an enlargement, which, on the posterior part of the 
body, is a prominent tubercle. Ventrals 159-161; anal entire; 
subcaudals 52-55 pairs. Yellowish brown or pale olive above, 
with dark brown triangles on the sides, the apices meeting or 
approaching on the vertebral line; posteriorly, the united triangles 
forming cross-bands ; a yellowish band, edged with dark brown 
below, extending from the eye to the side of the neck; belly dark 
brown with some yellowish spots, or yellow anteriorly, gradually 
darkening to black on the tail. 
Total length 630 millim. ; tail 100. 
Peru, Ecuador. 
a. 5 (V. 161; C. 55). Guayaquil. Mr. Fraser [C.]. 
6. Lachesis pictus. 
Lachesis picta, Tschudi, Faun, Per., Herp. p. 61, pl. x. (1845); Gray, 
Cat. p. 13 (1849). 
Bothrops pictus, Jan, Elenco, p. 126 (1863), and Icon. Gén. 47, pl. iii. 
fig. 3 & pl. iv. fig. 2 (1875). 
Snout obliquely truncate, with sharp raised canthus all round. 
Rostral as deep as broad or a little deeper than broad; nasal 
divided ; upper lhead-scales small, juxtaposed or subimbricate, 
largest and smooth on the snout, feebly keeled and in 5 to 7 
longitudinal series between the supraoculars, which are large ; 
a pair of small internasals, in contact with each other; two series 
of scales between the eye and the labials; temporal scales feebly 
keeled ; 8 or 9 upper labials, second entering the loreal pit, third 
and fourth largest. Scales strongly keeled, in 21 to 23 rows. 
Ventrals 157-172; anal entire; subcaudals 40-74 pairs. Pale 
brown above, with a dorsal series of large black-edged brown spots 
which may be confluent and form an undulous or zigzag band; 
sides with small black spots; a dark streak behind the eye and a 
vertical bar below the eye; yellowish beneath, dotted or spotted 
with brown. 
Total length 310 millim.; tail 43. 
Peru. 
