SNAKES OF NORTH-EAST AFRICA. 651 



III. Eye small or ver.y small; no loreal ; nasal, if present, single; scales in 

 15 rows. 



A. Subcaudals paired; ventrals 171-256. 



Nasal and internasals present Micrelaps. 



No nasal or internasals ; nostril in the first upper labial Cliilorliinojyhis. 



B. Subcaudals single. 



Internasal in contact with first upper labial ; ventrals 104-115 ; 



subcaudals 11-13 BracliynpUs. 



Nasal in contact with rostral ; ventrals 145-165 ; subcaudals 



48-71 Aparallactus. 



1. DiTYPOPHIS. 



Giinth. P. Z. S. 1881, p. 462 ; Bouleng. Cat. Su. iii. p. 46. 



1. DiTYPOPHIS viVAX Giinth. 1. c. pi. xl. ; Bouleng. 1. c. 

 Socotra. 



2. Tarbophis. 



Fleisclim. Dalm. nov, Serp. Gen. p. 17; Bouleng. Cat. Sn. iii. 

 p. 47. 



Two species : — 



Scales in 19 or 21 rows ; anal entire T. guentheri. 



Scales in 21 or 23 rows ; anal divided T. obtusus. 



1. Tarbophis guentheri Anders. P. Z. S. 1895, p. 656, 

 pi. xxxvi. fig. 3 ; Bouleng. t. c. p. 52. 



East Africa, as far north as Soinaliland ; Arabia, Syria. 



2. Tarbophis obtusus. 



Colnher obttfsus Reuss, Mus. Senckenb. i, 1834, p. 137. 



Tarbophis obtusus Bouleng. 1. c. 



Egypt to Somaliland, Mauritania and 'N. Nigeria. 



3. Leptodira. 



Giinth. Cat. Col. Sn. p. 165 ; Bouleng. Cat. Sn. iii. p. 88. 



1. Leptodira hotambceia. 



Coronella hotambcaia Laur. Byn. Rept. p. 85. 

 Leptodira hotamboeia Bouleng. t. c. p. 89, 

 Tropical and South Africa. 



4. Hemirhagerrhis. 

 Boettg. Zool. Anz. 1893, p. 119 ; Bouleng. Cat. Sn. iii. p. 119. 



1. Hemirhagerrhis kelleri Boettg. t, c. p. 129 ; Bouleng. 1. c. 

 Somaliland and British East Africa. 



