THE PRINCIPAL SPECIES OF POISONOUS SNAKES 115 
Total length, 630 millimetres; tail 100. 
Habitat : Peru, Ecuador. 
(6) ZL. pictus.—Snout obliquely truncate ; two series of scales 
between the eye and the labials; scales in 21—23 rows, strongly 
keeled ; 157—172 ventrals ; 40—74 pairs of subcaudals. 
Colour pale brown, with a dorsal series of large black-edged 
brown spots, which may form a vertebral zigzag band; a black 
streak behind the eye, and a vertical bar below the eye; belly 
yellowish, spotted with brown. 
Total length, 310 millimetres ; tail 43. 
Habitat: Peru. 
(7) L. alternatus.—Head narrow, elongate ; 8—9 supralabials ; 
scales in 29 
35 rows, very strongly keeled; 167—181 ventrals ; 
34—51 pairs of subcaudals. 
Colour brown, very elegantly marked with opposite or alternat- 
ing pairs of large C-shaped markings, which are dark brown, 
edged with black and yellow, and separated by narrow interspaces 
of the ground colour; head dark-brown above, with a 4-shaped 
hight marking, the transverse bar between the eyes; belly whitish, 
spotted with brown or black. 
Total length, 1,190 millimetres ; tail 110. 
Habitat : Southern Brazil, Paraguay, Uruguay, Argentina. 
(8) L. neuwiedii (known as the Uruti in Brazil; fig. 70).— 
Snout obtusely pointed; supraocular large, separated from its 
fellow by 6—9 longitudinal series of scales; 8 or 9 supralabials ; 
scales very strongly keeled, in 21—27 rows; 168—182 ventrals ; 
41—53 subcaudals. 
Colour yellowish or pale brown, with dark brown black-edged 
spots; the spots on the back form a single series or a double 
alternating series; 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 ; belly yellowish, more or less powdered with brown. 
Total length, 770 millimetres ; tail 120. 
Habitat: Brazil, Paraguay, Argentina. 
