snakes of north-east africa. 655 



15. Brachyophis. 



Mocquarcl, Mem. Cent. Soc. Philom. 1888, p. 125 ; Bouleng. 

 Cat. Sn. iii. p. 254. 



1. Brachyophis revoili Mocquarfl, 1. c. pi. xi. fig. 3 ; Bouleng. 

 I.e. 



Somalilanrl. 



16. Aparallactus. 



A. Smith, 111. Zool. S. Afr., Kept., App. d. 15 ; Bouleng. Cat. 

 Sn. iii. p. 255. 



1. Aparallactus concolor. 



UripxMs concolor Fiscli. Jahrb. Hamb. Wiss. Anst. i. 1884, p. 4, 

 pi. i. fig. 1. 



Aparallactus concolor Bouleng. t. c. p. 257. 

 Lado, Uganda, Somaliland. 



C. Proteroglypha. 



(Loreal absent in all the genera.) 



I. Tail compi-essed, oai'-shaped ; scales juxtaposed ; no ventrals 



(Sea-snake) Si/drus. 



II. Tail C3'lindrical ; scales imbricate ; ventrals large. 

 Head short, snout broader than long ; scales oblique, 17-25 across 



middle of body, 21-29 across neck ; anal entire Na ia. 



Head short, snout broader than long ; scales not oblique, 23 across 



middle of bodj', 27 across neck ; anal divided WaUerinnesia. 



Head long and narrow, snout not broader than long ; scales verj' 



oblique, in 19 to 23 rows Dendraspis. 



-^ 1. Hydrus. 



Schneid. Hist. Amph. i. p. 233 ; Bouleng. Cat. Sn. iii. p. 266. 



1. Hydrus platurus. 



Anguis platibra Linn. S. N. i. p. 391. 

 Hydrus platvjrus Bouleng. t. c. p. 267. 



Indian and Pacific Oceans ; E. Africa as far north as the 

 coast of Obok. * 



2. Naia. 



Laur. Syn. Rept. p. 90; Bouleng. Cat. Sn. iii. p. 372. 



Two species : — 



Eye separated from the upper labials by suboculars ; 6th or 7th 



upper labials largest and deepest N. liaie. 



Third or third and fourth upper labials deepest and entering the eye. JV. nigricoJlis. 



1, ISTaia haib. 



Coluber haie Linn. S. N. i. p. 387. 

 Naia haie Bouleng. t. c. p. 374. 



Borders of the Sahara, East Africa southwards to the Transvaal 

 and Zululand ; Arabia, Palestine. 



45* 



