SNAKES OF NORTH AFRICA, 307 



1. Cerastes cornutus Forsk, Descr. Anim. p. ix ; Bouleng. t. c. 

 p. 502. 



Borders of the Sahara and Soudan, Arabia and Palestine. 



2, Cerastes vipera. 



Goluhra vipera Linn, in Hasselq. Reise Falsest, p. 314. 



Cerastes vipera Bouleng. t. c. p. 503. 



Northern border of the Sahara, froiii Algeria to Egypt, Sinai. 



4. EcHis. 



Merr. Tent. p. 149 ; Bouleng. Cat. Sn. iii. p. 504. 



Two species : — 



Scales oil snout and vertex more or less strongly keeled; 2 (rarely 1 

 or 3) series of scales between eye and upper labials ; veutrals 

 132-192 ^. carinatits. 



Scales on snout and vertex smooth or obtusely keeled ; 3 or 4 series 



of scales between eye and upper labials; ventrals 174-205 IE. coloraius. 



1. ECHIS CARTNATUS. 



Pseudohoa carinata Schneid. Hist. Aniph. ii. p. 285. 

 Echis carinatits Bouleng. t. c. p. 505. 



Desert and sandy districts of Africa north of the Equator ; 

 Southern Asia from Transcaspia and Arabia to India. 



2. Echis coloratus Giinth. P. Z. S. 1878, p. 978: Bouleng. 

 t. c. p. 505. 



Egypt, Socotra, Arabia, Palestine. 



Proc. Zool. Soc— 1919, No. XXII. 



