38 EINAR LÖNNBERG, FISHES. 



The hydrographic conditions of North East Africa are not so well studied that 

 it is possible to form any theory about how the distribution of the freshwater fishes 

 has taken place in that country. It is, howe.ver, of interest to see that even in such 

 a little collection as tliis, fishes from the rather isolated Guaso Nyiri System are 

 found which appear to indicate relationship as well towards the south with inhabi- 

 tants of Tana River System (and in one case even with Tanganyika) as also, and 

 prineipally, towards the north and north east. 



Mormyrus kannume Forsk. 



Ulgk. : Cat. Fresh Water Fish. Afr. I. p. 134. 



A specimen from Guaso Nyiri agrees in essential points with Mormyrus kan- 

 nume Forskål but there are some small differences. The specimen from Guaso Nyiri 

 has only three notched teeth in the upper jaw. The dorsal has only 53 rays and 

 there are only about 24 scales round the caudal peduncle. 



Barbus duchesni Blgr. 



Blgr.: Gat. Fresh Water Fish. Afr. II. p. 31. 



Several specimens were obtained in Guaso Nyiri above Chanler Falls. The 

 largest measuring 31 cm. without caudal or 35 to end of middle caudal rays. 



A number of specimens were also obtained below Chanler Falls, and among 

 them several had 8 branched dorsal rays, and the shape of the sharply pointed anal 

 approaching to that in B. kassamensis Blgr., but all other characteristics especially 

 the general shape of the body, the length of the snout, and the position of the dorsal 

 fin are as in B. duchesni. The latter name is therefore undoubtedly the most correct 

 to use, although both races appear to be very closely allied. 



Barbus duchesni is according to Boulenger (1. c.) found in Lake Tsana and 

 upper tributaries of Blue Nile; Hawash River System; Omo River System; Lakes 

 Abaia and Stephanie. It is thus rather widely distributed in certain parts of North 

 East Africa. 



Barbus tanensis Gthr. 



Ulgk.: Cat. Fresh Water Fish. Afr. II, p. 54. 



Specimens were obtained at the type locality viz. in Thika river. 



Barbus krapfi Blgr. 



Blgb. : Cat. Fresh Water Fish. Afr. II, p. 54. 



Specimens of this easily recognized species were caught on hook and line in 

 Itiolu and Lekiundu rivers, tributaries from the southern side to Guaso Nyiri 4 /s 1911. 



