THE PBTNCIPAL SPECIES <)]•' PnTSONOrS SNAKES lU 



Total length, 680 millimetres ; tail 100. 

 Habitat : Peru, Ecuador. 



(6) L. pictus. — Snout obliquely truncate ; two series of scales 

 between the eye and the labials ; scales in "21 — '23 rows, strongly 

 keeled; 157 — 17"2 ventrals ; 40 — 7-4 pairs of subcaudals. 



Colour pale brown, with a dorsal series of large black-edged 

 brown spots, which may form a vertebral zigzag l)and ; 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. alternatua. — Head narrow, elongate; 8 — 9 sapralabials ; 

 scales in 29 — 35 rows, very strongly keeled ; 1G7 — 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 w^ith black and yellow, and separated by narrow interspaces 

 of the ground colour ; head dark brown above, with a j^-shaped 

 light marking, the transverse bar between the eyes ; belly whitish, 

 spotted with brown or black. 



Total length, 1,190 milbmetres ; tail 110. 



Habitat : Southern Brazil, Paraguay, Uruguay, Argentina. 



(8) L. nemviedii (known as the U)-i(fa in Brazil; fig. 70). — 

 Snout obtusely pointed; supraocular large, separated from its 

 fellow by G — 9 longitudinal series of scales ; H 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. 



