Colour: Body with black annuli disposed in threes, with red interspaces; head yellow; end of snout black; a black band across the eyes. Total length, 575 millimetres; tail 40. _Habitat_: Amazons, Colombia. (24) _E. mipartitus._--Scales in 15 rows; 210-278 ventrals; 24-34 subcaudals. Colour black, with 40-68 narrow white annuli; head black to between the eyes, elsewhere yellow. Total length, 610 millimetres; tail 50. _Habitat_: Central America and Tropical South America. (25) _E. fraseri._--Scales in 15 rows; 303 ventrals; 25 subcaudals. Colour black, with 75 narrow whitish rings with broken outlines; head black in front, yellow behind. Total length, 780 millimetres; tail 40. _Habitat_: Ecuador. (26) _E. mentalis._--Scales in 15 rows; 255-268 ventrals; 30-31 subcaudals. Colour: Body black, with 58-70 narrow white annuli, which become wider on the belly; snout black, occiput yellow; tail annulate, black and orange. Total length, 490 millimetres; tail 30. _Habitat._--Colombia and Ecuador. (27) _E. ancoralis._--Scales in 15 rows; 258 ventrals; 31 subcaudals. Colour: Body with 16 sets of black annuli disposed in threes, the middle one of each set a little wider; head light in front, spotted with black; an anchor-shaped black mark on the occiput and nape. Total length, 780 millimetres; tail 57. _Habitat_: Ecuador. (28) _E. narduccii._--Scales in 15 rows; 240-315 ventrals; 15-33 subcaudals. Colour black, beneath with yellow or red cross-bands or transversely oval spots, sometimes extending as triangular blotches up the sides; head with a yellow cross-band. Total length, 720 millimetres; tail 50. _Habitat_: Eastern Ecuador, North-eastern Peru, Bolivia. The species of the genus _Elaps_, which are remarkable for the brightness and beauty of their colours, are generally found in forests. “The traveller,” says Neuwied, “who ventures into the great Brazilian forests, where the ground is covered with leafy plants, is astonished to see shining through the verdure the black and red rings of the beautiful Coral Snake. Uncertainty as to whether the creature is dangerous alone prevents him from seizing it. The body of the snake is not lithe enough to enable it to climb trees. Its food consists of small animals.” Dr. Lacerda relates that the Austrian naturalist Wertheimer, when in the Brazilian settlement of Philadelphia, was bitten by a Coral Snake in the back of the hand. The usual symptoms of poisoning manifested themselves immediately, and the unfortunate man died twelve hours later. Nevertheless, the small size and slenderness of the fangs, the narrowness of their canals, and the considerable distance between the fangs and the anterior opening of the mouth, must necessarily render the bites of these snakes less serious and of rarer occurrence. II.--VIPERIDÆ.--CROTALINÆ.