LIST OF SOUTH AFRICAN SNAKES. 461 



1. Causus rhombeatus. 



Sepedon rhombeatus, Lichtenst. Verz. Doubl. Mus. Bed. p. 106. 



Causus rhomheatus, Bouleng., t.c, p. 467. 



Tropical and South Africa. 



Gape Colony : Cape Peninsula (Tinley) ; Knysna (Oakley) ; Burghers- 

 dorp (Kannemeyer) ; Tsomo, Transkei (Watermeyer) ; George 

 (Leipoldt) ; Port St. Johns (Shortridge) ; Kimberley (French). 



Basutoland : Morija (Dyke). 



Natal: Durban (Bowker). 



Transvaal : Barberton (Kendall) ; Krugersdorp (Watson). 



Southern Rhodesia : Salisbury (Marshall) ; Mazoe (Darling). 



2. Causus defilippii. 



Heterodon defilippii, Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 225. 



Causus defil ppii, Bouleng., t.c, p. 469. 



Natal, Transvaal, Southern Rhodesia, Central and East Africa. 



Natal: Pinetown (Bowker). 



Transvaal: Barberton (Rendall). 



Rhodesia: Salisbury (Thomas) ; Livingstone (Sykes). 



2. BITIS 



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



Six Species in South Africa. 



I. Nostrils directed upwards ; scales in 31 to 41 rows . . B. arietans. 



II. Nostrils directed upwards and outwards ; scales in 



21 to 31 rows 



A. Supraocular region not rai.sed, without horn-like 



scales ; sub-caudals well developed and smooth 



in both sexes. 

 Outer row of scales smooth . . . . . . . . B. peringueyi. 



Outer row of scales keeled . . . . . . . . . . B. atropos. 



B. Supraocular region raised, without horn-like 



scales ; sub-caudals well developed and smooth 



in both sexes . . . . . . . . . . B. inornata. 



C. Supraocular region usually with horn-like scales ; 



sub-caudals, in females, small and scale-like, 



more or less distinctly keeled. 



Several supraorbital horns . . . . . . . . B. cornuta. 



Supraorbital horn, if present, single . . . . . . B. caudalis. 



1. BiTIS ARIETANS. 



Viper a arietans, Merrem, Tent. Syst. Amph. p. 152. 



Bitis arietans, Bouleng., t.c, p. 493. 



Tropical and South Africa, Arabia. 



Cape Colony : Cape Peninsula (Oakley) ; Paarl (Hugo) ; Port St. Johns 



(Shortridge) ; Port Ehzabeth (Moorhouse) ; Little Namaqualand 



(Peringuey) . 

 Basutoland : Morija (Dyke). 

 Natal : Victoria County (Bowker). 

 Southern Rhodesia : Mazoe (Darling) ; Hunyani River (Thomas) ; 



Salisbury (Thomas). 

 South- West Africa : Damaraland (Fairbridge) . 



2. BiTIS PERINGUEYI. 



Vipera peringueyi, Bouleng. Ann. & Mag. N. H. (2) ii., 1888, p. 141. 

 Bitis peringueyi, Bouleng., t.c, p. 495. 

 South-West Africa, Kalahari, Angola. 

 Walfisch Bay territory (Nightingale), type. 



