(4) _E. gravenhorstii._--First lower labial in contact with its fellow; posterior nasal not reaching the præocular: 191 ventrals; 23 subcaudals. Colour: Seven sets of black annuli disposed in threes, median annulus the broadest; head black, with a yellow transverse band behind the eyes. Total length, 550 millimetres; tail 50. _Habitat_: Brazil. (5) _E. langsdorffii._--Ventrals 204-225; subcaudals 37-54; 1 + 1 temporals. Colour dark brown, with 63 transverse series of cream-coloured spots, each occupying one scale; belly yellow, with red cross-bands. Total length, 300 millimetres. _Habitat_: Upper Amazons. (6) _E. buckleyi._--203-211 ventrals; 39-43 subcaudals; 1 + 2 temporals. Colour orange, with 48-60 black annuli edged with small yellow spots; head black; temples yellow. Total length, 505 millimetres; tail 70. _Habitat_: Northern Brazil, Eastern Ecuador. (7) _E. anomalus._--227 ventrals; 29 subcaudals; 1 + 1 temporals. Colour: Body with 55 black annuli separated by narrow brownish-white bands; belly yellowish; anterior half of head black, posterior half yellow; tail yellow or red, with 4 black rings. Total length, 280 millimetres; tail 23. _Habitat_: Colombia. (8) _E. heterozonus._--Scales in 15 rows; 210-219 ventrals; 16-23 subcaudals; 1 + 1 temporals. Colour red or brown, with 17 to 23 black rings, mostly narrower than the interspaces; a black band on the head across the eyes. Total length, 900 millimetres; tail 40. _Habitat_: Eastern Ecuador, Eastern Peru, Bolivia. (9) _E. elegans._--Scales in 15 rows; 189-221 ventrals; 29-47 subcaudals; 1 + 1 temporals. Colour: Black annuli in sets of three, separated by reddish-brown interspaces; 12-17 sets; head black, with yellow blotches. Total length, 730 millimetres; tail 70. _Habitat_: Mexico and Guatemala. (10) _E. annellatus._--Scales in 15 rows; 200-211 ventrals; 30-45 subcaudals; 1 + 1 temporals. Colour black, with 41-49 narrow white rings on the body, 4-7 on the tail; a white ring on the head. Total length, 490 millimetres; tail 70. _Habitat_: Eastern Peru. (11) _E. decoratus._--Scales in 15 rows; 196-213 ventrals: 29-37 subcaudals. Colour red, with 15-16 sets of black annuli disposed in threes; head yellow, with end of snout black, and a black band across the eyes. Total length, 625 millimetres. _Habitat_: Brazil. (12) _E. dumerilii._--Scales in 15 rows; 197-204 ventrals; 50-53 subcaudals. Colour: 8-9 sets of three black annuli on red and yellow; head black, with a yellow band on the occiput. Total length, 410 millimetres; tail 65. _Habitat_: Colombia. (13) _E. corallinus_ (The Coral Snake).--Scales in 15 rows; 179-231 ventrals; 30-47 subcaudals; 1 + 1 temporals. Colour: Body with black annuli, separated by red interspaces edged with yellow; head bluish-black; temples yellow; a blue line from behind the eye to the lower jaw; tail white. Total length, 790 millimetres; tail 70.