1	Labial pits present; dark stripes on head	2
–	Labial pits absent	3
2	Deep labial pits; variable coloration, usually brown, with dark round blotches along the body; long and prehensile tail; higher than 105 subcaudals	Corallus hortulanus
–	Shallow labial pits; amber coloration with lighter ocelli on dorsum; lateral white and brown stripes present at 1/3 of the body; lateral ocelli uniform of brownish coloration and white spots on top; 40–60 subcaudals	Epicrates assisi
3	Large sized snake; olive green dorsal coloration with black ocelli along the body; venter yellowish and pigmented	Eunectes murinus
–	Grayish coloration with brown blotches; lateral brown ocelli; tail with reddish brown blotches separated by a white stripe; postocular stripe present	Boa constrictor constrictor