SNAKES. 117 
of the body large, flat, elongated, rounded at the end ; an elongated 
plate between the nasal and rostral plates. 
Inhab. Shores of Euphrates, Martin. Mus Zool. Soc. ? 
I have not been able to find it in the collection: it may be 
the same as D. Xanthina. 
Page 27, add 
1. The Peruvian ADpER. Clotho? ocellata. Echidna ocel- 
lata, Tschudi, Rept. Consp. 166. 
Brown, with two longitudinal series of pale centred black spots ; 
beneath ash-brown ; shields 139-422. Length 10 inches. 
Inhab. Peru, Tschudz. 
This is the only species of Vipertde found in the Western 
World. I do not know to which genus it properly belongs, as I 
have not seen it. 
Page 27. Crrastes, add 
Cerastes sp., Rafin. Anal. Nat. 77, 1815. 
