snakes of east africa. 625 



15. Geayia. 

 Giinth. Cat. Col. Sn. p. 50 ; Boaleng. Cat, Sn. ii. p. 286. 



Two species : — 



Scales in 17 rows ; ventrals 145-168 ; .subcaudals 89-102 G. smythii. 



Scales iu 15 rows; ventrals 130-143; subcaudals 100-128 Gr. tholloni. 



1 . Geayia smythii. 



Coluber smythii Leach, in Tuckey's Exploi-. R. Zaire, App, 

 p. 309. 



Graijia smythii Bouleng. t. e. (part.), and P. Z. iS. 18997 ^h 

 p. 948, figs. 



West and Central Africa and Uganda. 



2. Geayia tholloni Mocquard, Bull. Soc. Pliiloiu. (8) ix. 1897, 

 p. 11 ; Bouleng. P. Z. S. 1-84^, p. 951, fig. 



Egyptian Soudan, Uganda, French Congo, Katanga. 



16. HOMALOSOMA. 



Wagl. 8yst. Amph. p. 190; Bouleng, Cat. Sn. ii. p. 273. 



1. HOMALOSOMA LUTRIX. 



Coluber lutrix Linn. S. IS", i. p. 375. 

 lioinalosoma lutrix Bouleng. t. c. p. 274. 

 Homalosovia shiranum Bouleng, t. c. p. 276. 

 Homalosoma ahyssinicum Bouleng. 1. c. 

 East Africa,_ JSTyassaland, South Africa. 



17. Peosymna. 

 Gray, Cat. Sn. p. 80 ; Bouleng. Cat. Sn. ii. p. 246. 



Synoi)sis of the Species. 



Snout with angular horizontal edge ; two postoculars ; ventrals 131- 



153 J>. amhifjiia. 



Snout with angular horizontal edge; a single postocular; prsefrontal 



entering the ej'e ; ventrals 151-167 P.bocagii. 



Snout rounded; two postoculars ; ventrals 140-143 P. variabilis. 



1. Peosymna ambigua Bocage, Jorn. Sc. Lisb. iv. 1873, p. 218; 

 Bouleng. t. c. p. 248. 



Zanzibar Coast to Zululand, N. Rhodesia, Angola. 



2. Peosymna bocagii Bouleng. Ann. & Mag. N. H. (6) xix. 

 1897, p. 278, fig., and Ann. Mus. Congo, Zool. ii. 1901, p, 9, 

 pi. iii. fig. 4. 



Prosymna fassei Mocquard, Bull. Mus. Paris, 1906, p. 250. 

 Ubanghi and Mozambique. 



'i 



