540 yiPEEiD^. 



5. Lachesis microplithalmTis. 



Buthrops microphthalmus, Cope, Journ. Ac. Philad. (2) viii. 1876, 

 p. 182. 



Snout short, rounded, with distinct canthus ; eye very small. 

 Rostral slightly deeper than broad ; nasal divided ; upper head- 

 ecales 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 ; 

 flubcaudals 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 milUm. ; tail 100. 



Peru, Ecuador. 



a. S (V. 161 ; C. 65). Guayaquil. Mr. Fraser [C.]. 



6. Lachesis pictus. 



Lachesis picta, Tschudi, Faun, Per., Herp. p. 61, pi. x. (1845) ; Gray, 



Cat. p. 13 (1849). 

 Bothrops pictus, Jan, Eleneo, p. 126 (1863), and Icon. O&n. 47, pi. iii. 



fig. 3 & pi. iv. fig. 2 (1875). 



Snout obliquely truncate, with sharp raised canthus all round. 

 Eostral as deep as broad or a little deeper than broad; nasal 

 divided ; upper head-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. 



