SXAKES OF XORTH-EAST AFRICA. G57 



1. Causus RHOMBEATUS. 



Sepedon rhomheatus Licht. Yerz. Doubl. Mus. Berl. p. lOG. 

 Causus rhombeatas Bouleng. t. c. p. 467. 

 Ti'opical and South Africa. 



2. Causus resimus. 



lleterojjhis resimus Peters, Moii. Berl. Ac. 1862, p. 277, pi. — , 

 fig. 4. 



Catisus resimus Bouleng. t. c. p. 468. 



Eastern Soudan, East and Central Africa, Angola. 



2. Bms. 



Gray, Zool. Miscell. p. 69 ; Bouleng. Cat. Sn. iii. p. 492. 



1. BlTIS ARIETANS 



Vipera arietaiis Merr. Tent. p. 152. 

 BitAs arietans Bouleng. t. c. p. 493. 

 'Tropical and South Africa; Southern Arabia. 



3. Cerastes. 

 Wagl. Syst. Auipli. p. 178 ; Bouleng. Cat. Sn. iii. p. i)01. 



1. Cerastes corxutus. 



Coluber cornutus Linn, in Hasselq. Beise Palaest. p. 315. 



Cerastes cornittus Bouleng. t. e. p. "502. 



Soudan and borders of the Sahara, ; Arabia and Palestine. 



4. EoHis. 

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



Two species; — ■ 



Scales on snout and vertex more or less strongly keeled ; 2 (rare]}' 1 

 (H- 3) series of scales between eye and upper labials; ventrals 

 132-192 J?, carina/ us. 



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



of scales between eye and upper labials ; ventrals 174-205 JE. eolorahis. 



1. ECHIS CARIXATUS, 



Fseucloboa carinata Schneid. Hist. Amph. ii. p. 285. 

 Echis carlnatus 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 Giuith. P. Z. S. 1878, p. 978 ; Bouleng. t. c. 

 p. 507, pi. XXV. fig. 1. 



Egypt, Socotra, Arabia, Palestine. 



