138 ME. G. A. BOULENGER ON A COLLECTION 



Perciform Fishes, a very natural group the habitat of which extends over the fresh 

 waters of the whole of Africa, Madagascar, South-western Asia, Southern India and 

 Ceylon, and Central and South America. They also confirm the no less remarkable 

 negative feature of the absence of Mormyrids, a family so eminently characteristic of 

 the Ethiopian fresh waters, occurring as they do in all the rivers of Tropical Africa, 

 and in all the lakes north and south of Tanganyika. Lastly, they add to the list of 

 Cyprinids, and bring out the interesting fact of the presence in that lake of a species 

 of Capoeta, which genus, well represented in Southern Asia, was known in Africa from 

 a single species inhabiting Abyssinia. But the general conclusions which could be 

 drawn from the study of the first collection require no modification. 



An important addition has been made to our knowledge of the Central-African 

 lakes through Mr. Moore's investigation of Lake Kivu, to the north of Tanganyika, 

 and overflowing into the latter through the Rusisi River, but without any communica- 

 tion with any other basin, and this investigation has failed to throw any light on the 

 problem of the halolimnic fauna. With regard to the piscine inhabitants of Kivu, the 

 information gained goes simply to show that its waters are very thinly populated. 

 Its former connection with the Nile, at probably no very remote period, geologically 

 speaking, as ascertained by the Expedition, may account for the presence of Tilapia 

 nilotica, a species which has not been found in the Tanganyika nor in the Congo 

 Basin. Along with it were obtained examples of another Tilapia (T. burtoni) previously 

 known from Tanganyika, a Paratilapia {P. bloyeti) described from East Africa, a new 

 species of the same genus, and a new Barbus. No representatives could be found of 

 any of the numerous generic types of Gichlidce which are the essential feature of the 

 fish-fauna of the great lake. 



The number of specimens brought home on this occasion from Tanganyika and 

 Kivu amounts to 190, representing 50 species, 20 of which were new to science, 

 obtained at the following localities, enumerated from south to north, as well as from 

 far out in Lake Tanganyika: — 



Kinyamkolo, extreme south end of Lake Tanganyika. 



Kalambo, S.E. of lake. 



Tembwi, W. coast, 35 or 40 miles S. of Albertville. 



Msambu, E. coast, S. of middle. 



Kibogo, E. coast, middle of lake. 



Kibwesi, near Kibogo. 



Maswa, E. coast, about 50 miles S. of Ujiji, 



Usambura, N. end of lake. 



Busisi R., at mouth. 



Rusisi R., at source. 



L. Kivu. 



In the introduction to the first Report, I tabulated the species then known from 



