414 CYPEINODONTID^E. 



Male brown, with dark edges to the scales; dorsal fin dark purplish brown; anal 

 and caudal fins purplish brown, with a whitish band across the middle. Female 

 lighter and uniformly coloured, the fins lighter. 



Measurements (in millimetres). 



tf. ?. 



Total length 52 40 



„ ,, (without caudal) 44 34 



Depth of body 14 9 



Length of head 14 10 



Width of head 7 5 



Length of snout 3 2\ 



Diameter of ej^e 4 3 



Interorbital width 6 4 



Longest ray of dorsal fin 10 6 



„ „ anal fin 8 6 



Length of pectoral fin 8 6 



„ ventral fin 4 3 



This little fish, discovered by Dr. G. A. Fischer in the Victoria Nyanza and in Lake 

 Tshaya in Unyamwesi (drainage of the Tanganyika), has been very imperfectly described. 

 Thanks to the courtesy of Dr. Pappenheim, I have been able to describe the species 

 from two specimens, types from Lake Victoria, entrusted to me by the authorities of 

 the Berlin Museum. I have also examined three female specimens from the Bubu 

 lliver (Coll. O. Neumann, Sept. 1893) near Irango, south of Lake Manyara. 



As already stated by Prof. Pfeffer, F. tceniopygus is very closely related to the East- 

 African F. guentheri, Pfeff. (orthonotus, Gthr. & Playf., nee Peters), differing chiefly 

 in the narrower interorbital space, which is fully half the length of the head in 

 F. guentheri, and in the coloration. The presence of small nuptial tubercles on the 

 fins of the male, which has been given as a distinctive character, is also to be found 

 in fully developed males of F. gnentheri. 



