SNAKES OF EAST AFRICA. 619 



B. Snout with angular horizontal edge, or internasal and prefrontal single. 

 Eye in contact with labials; internasal and prefrontal single; 



scales in 15 or 17 rows ; ventrals less than 170 Prosymna. 



Suboculars separate the eye from the labials ; scales in 19 to 25 



rows; ventrals more than 170 ScapJiiopJiis. 



II. No loreal, nasal in contact with prfeocular ; pupil vertically 

 elliptic ; scales strongly keeled, some of the laterals very 

 oblique Dasifpeltis. 



1. Tropidonotus. 



Kuhl, Bull. Sc. Nat. ii. 1824, p. 81 ; Bouleng. Cat. Sn. i. 

 p. 192. 



1. Tropidonotus olivaceus. 



Goronella oUvacea Peters, Mon. Berl. Ac. 1854, p. 622. 



Trojndonotus olivaceus Bouleng. t. c. p. 227. 



Grayico giardi Dollo, Bull. Mus. Belg. iv. 1886, p. 158,%.; 

 Bouleng. op. cit. ii. p. 288. 



Tropical Africa, from the Soudan to Angola, and Southern 

 Rhodesia. 



2. Glypholycus. 



Giinth. P. Z. S. 1893, p. 629 ; Bouleng. Cat. Sn. iii. p. 615. 

 Two species : — 



Scales in 23 or 25 rows ; nasal semidivided , G.hicolor 



Scales in 19 rows; nasal divided G. whytii. 



1. Glypholycus bicolor Gdnth. I.e., fig.; Bouleng. 1. c. 

 Lake Tanganyika. 



2. Glypholycus whytii Bouleng. P. Z. S. 1897, p. 802, 

 pi. xlvi. fig. 2. 



Nyassaland, 



3. BothropHthalmus. 



Peters, Mon. Berl. Ac. 1863, p. 287; Bouleng. Cat. Sn. i, 

 p. 324. 



1. Bothrophthalmus lineatus. 



ElapMs {Botliro'pliihal'mus) Imeatns Peters, 1. c. 



Bothrophthahnus line.atus Bouleng. 1. c. 



From the Gold Coast and Uganda to the Congo. 



4. BOODON. 



Dum. & Bibr. Mem. Ac, Sc. xxiii. 1853, p. 460 ; Bouleng. Cat. 

 Sn. i. p. 327. 



Synopsis of the Species^ 



T. Subcaudals in two rows. 

 Praiocular not extending to upper surface of head ; scales in 23 or 



25 rows; ventrals 175-195; no light lines on side of head B. infernal is. 



