168 Dr. A. Giinther on a new Genus of West African Snakes, 



d. Nine zones round the trunk; ventrals 238, caudals 24. — One 

 specimen from Bahia. 



e. Ten zones round the trunk; ventrals 228, caudals 26. — Two 



specimens from Bahia. 

 /3. A yellow ring is half as wide as an outer black one ; one zone and* 

 a half round the tail. 



a. Nine zones round the trunk; ventrals 231, caudals 34. — One 



specimen from the West Indies. 



b. Ten zones round the trunk; ventrals 220, caudals 36. — One spe- 



cimen. 



c. Ten zones round the trunk ; ventrals 245, caudals 33. — One spe- 



cimen from Trinidad. 



d. Fourteen zones round the trunk; ventrals 262, caudals 30. — 



One specimen from Brazil. 



2. No white cross-band before the eyes. 



u. Nasal separated from the prseocular by the third labial shield : E. 

 Gravenhorstii, Jan, founded on a single specimen from Brazil ; 

 it is described as having the middle black ring twice as wide as 

 an outer one, but the figure represents it narrower. 



/3. Nasal in immediate contact with the prseocular. 



a. The black rings not confluent on the belly. 



««. Shields of the muzzle and of the crown black, anteriorly 

 margined with yellow ; thirteen zones round the body, one 

 round the tail. — One specimen from the Argentine Republic. 



/3/3. Muzzle and crown entirely black : E. Margravii, D. & B. 



b. The black rings of every zone confluent on the belly, and the 



yellow rings spotted with black. 



etcc. Ten zones round the trunk, and one or one and a half round 

 the tail; ventrals 230, caudals 22-24. — Two specimens from 

 Brazil. 



(3/3. Twelve zones round the trunk and one round the tail ; ven- 

 trals 232, caudals 20. — One specimen from Brazil. 



3. Muzzle entirely white : E. frontalis, D. & B. 



II. The intervening spaces of the red ground-colour are equal in width 



to the middle black ring : E. Tschudii, Jan. 



III. The intervening spaces of the red ground-colour are narrower than 

 the middle black ring ; a white band before the eyes. 



1. Ten zones round the trunk; ventrals 221, caudals 36. — One speci- 



men. 



2. Eleven zones round the trunk ; ventrals 240, caudals 39. — One spe- 



cimen. 

 B. The three black rings of each zone equal in width to one another. 



I. No white band before the eyes : IE. Margravii, D. & B. part. 



1 . Black rings not confluent on the belly. 



a. Eight zones and a half round the body, one half round the tail ; 



ventrals 222, caudals 22. — One specimen from River Capin 

 (Para). 



b. Twelve zones round the body, one round the tail ; ventrals 228, 



caudals 23. — Two specimens from Caraccas. 



2. Black rings confluent on the belly, a yellow band behind the eyes ; 



ventrals 199-213, caudals 29-3/ : E. elegans, Jan, from Mexico. 



II. A white band before the eyes. 



1 . The yellow rings are narrower than the black ones ; thirteen zones 



round the trunk, one and a half round the tail. — One specimen. 



2. The yellow rings are broader than the black ones ; ten zones round 



the trunk, one round the tail. — One specimen from St. Vincent's, 



