• sxakes of east africa. 635 



1. Hybrus. 

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



1. Hydrus platurus. 



Anguis platura Linn. S. IST. i. p. 391. 

 Hydrus platurus ^ow\eng. t. c. p. 267. 

 Indian and Pacific Oceans. 



2. BOULEXGERINA. 



Dollo, Bull. Mus. Belg. iv. 1886, p. 159; Bouleng. Cat. Sn. iii. 

 p. 357. 



1. BouiiENGERiNA STORMSi DoUo, 1. c. ; Bouleng. 1. c. 

 Lake Tanganyika. 



3. Elapechis. 

 Bouleng. Cat. Sn. iii. p. 358. 



Synopsis of the Sppxies. 



Scales in 13 rows ; iuternasals much shorter than the praef rentals.. 'E. guentherv. 

 Scales in 13 rows ; iuternasals three fourths the length of the 



praefroiitals J7. niger. 



Scales in 15 rows ; internasals hardly half as long as the prse- 



frontals E. boulengeri. 



1. Elapechis guentheri. 



Elapsoidea guentheri Bocage, Jorn. Sc. Lisb. i. 1866, p. 70, 

 pi. i. fig. 3. 



Elapechis guentheri Bouleng. t. c. p. 359. 



Tropical Africa, from the Gaboon and Uganda to Angola and 

 Nyassaland. 



2. Elapechis niger. 



Elapsoidea nigra Giinth. Ann. & Mag. IST. H. (6) i. 1888, p. 332. 

 Elapechis niger Bouleng. 1. c. pi. xx. fig. 1. 

 East Africa, Congo, IST. Rhodesia. 



3. Elapechis boulengeri. 



Elapsoidea hoxdengeri Boettg. Zool. Anz. 1895, p. 62. 

 Elapechis boulengeri Bouleng. t. c. p. 361. 

 Zambesi. 



4. Naia. 

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



Synopsis of the Species. 



Sixth (rarely seventh) upper labial largest and deepest ; eye 

 separated from the upper labials by suboculars ; a single 

 an terior temporal JV. Jiaie. 



Sixth upper labial largest and deepest, in contact with lower 

 postocular, third and fourth entering the eye; a single 

 anterior temporal JV. melanoleuca. 



Third upper labial deepest, sixth not in contact with postocular, 

 third or third and fourth entering the eye ; 2 or 3 superposed 

 anterior temporals jy. rnqrieaUi-s. 



