THE PBINCIPAL SPECIES OF POISONOUS SNAKES 117 



(9) L. ammodytoides. — Snout turned up, in the shape of a wart ; 

 two series of scales between the eye and the labials ; scales in 23 

 or 25 rows, very strongly keeled ; 149 — 160 ventrals ; 30 — 38 pairs 

 of subcaudals. 



Colour pale brown, with large brown black-edged spots or 

 cross-bands, which may alternate and form a zigzag band ; a dark 

 streak behind the eye ; belly yellowish, spotted with brown. 



Total length, 460 millimetres ; tail 55. 



Habitat : North-eastern Patagonia and Argentina. 



(10) L. xanthogrammus. — Head elongate, snout short ; scales 

 in 27 rows, feebly keeled ; 196 ventrals ; 54 subcaudals. 



Colour very dark olive, with a yellow zigzag line on each side 

 from the head to the base of the tail ; the angular parts enclose 

 rhombic spaces and lateral triangles ; top of head black, with a 

 pair of undulating yellow bands from the nape to the vertex ; 

 a bright golden band round the snout ; labials bright yellow ; 

 ventral shields black, paler in the middle, with yellow triangular 

 spots at their extremities. 



Total length, 1,530 millimetres; tail 190. 



Habitat : Eastern Ecuador, Andes of Colombia. 



(11) L. castelnaudi. — Head narrow and elongate ; scales on the 

 head smooth or feebly keeled, small; body-scales strongly keeled, 

 in 25 or 27 rows ; 230 — 258 ventrals ; 72 — 83 subcaudals, all or 

 majority in a single row. 



Colour greyish or brown, with dark or light-edged spots or 

 cross-bands ; head with . dark spots, one of which occupies the 

 middle of the snout ; a dark band from the eye to the angle of the 

 mouth ; belly brown or blackish, spotted with yellow. 



Total length, 1,220 millimetres ; tail 180. 



Habitat: Brazil, Ecuador, Eastern Peru. 



(12) L. iiummifer. — Snout broad, rounded ; 10 or 11 supralabials ; 

 scales in 23 — 27 rows, strongly keeled ; 121 — 134 ventrals ; 26 — 36 

 subcaudals, all or the majority single. 



Colour pale brown, with a dorsal series of rhomboidal spots, 



