220 MB. G. A. BOULENGEB ON 



J 1 . Dendbaspis JAMESONII. 



Elaps jamesonii Traill, in Schleg. Phys. Serp., Engl. Transl. 

 p. 179, pi. ii. figs. 19 & 20, 



Denclraspis neglecius Bocage, Herp. Ang. p. 138, pi. xv. fig. 2. 



Dendraspis jamesonii Bouleng. t. c. p. 436. 



-Tropical Africa, from Nigeria and Uganda to the Congo and 

 Angola. 



j 2. Dendbaspis angusticeps. 



Naia angusticeps A. Smith, 111. Zool. S. Afr., Rept. pi. lxx. 

 Dendraspis angusticeps Bocage, Herp. Ang. p. 140, pi. xv. 

 fig. 3 ; Bouleng. t. c. p. 437. 



East and Central Africa, Angola, South Africa. 



Family Vipebid^e. 



Synopsis of the Genera. 



I. Eye moderate or large, separated from the upper labials by suboculars ; ventrals 

 less than 180. 

 Upper sursace of head covered with large symmetrical shields ; 



pupil round Causus. 



Upper surface of head covered with scales ; pupil vertical ; sub- 



caudals in two rows JSitis. 



Upper surface of head covered with scales; pupil vertical; sub- 



caudals single ; tail prehensile Atlieris. 



II. Eye minute, with round pupil; upper surface of head 

 covered with large symmetrical shields ; no loreal ; a small 

 prseocular usually present ; ventrals 178-356 Atractaspis. 



1. Causus. 

 Wagl. Syst. Amph. p. 172 ; Bouleng. Cat. Sn. iii. p. 465. 



Syno2)sis of the Species. 



I. Scales in 17 rows or more ; subcaudals all or greater part in two rows. 



Snout obtuse, moderately prominent ; ventrals 120-155 C. rhombeatus. 



Snout prominent, often more or less distinctly turned up at the 



end; scales in 19 to 22 rows; ventrals 134-152 C. resimus. 



Snout prominent, more or less turned up at the end; scales in 



17 rows; ventrals 110-125 C. defilippii. 



II. Scales in 15 rows ; subcaudals single C. lichtensteinii. 



1. Causus bhombeatus. 



Sepedon rhombeatus Licht. Verz. Doubl. Mus. Berl. p. 106. 

 Causus rhombeatus Bouleng. t. c. p. 467 : Bocage, Herp. Ang. 

 p. 145. 



Tropical and South Africa. 



2. Causus besimus. 



Heterophis resimus Peters, Mon. Berl. Ac. 1862, p. 277, pi. — , 

 fig. 4. 



Causus resimus Bouleng. t. c. p. 468 ; Bocage, op. cit. p. 148. 

 East and Central Africa, Angola. 



