218 DR. A. GUNTHER ON A COLLECTION OF [Feb. 4, 
whence I believe no specimens have been received previously. I 
distinguish the following eight species among them :— 
Polypterus bichir. 
Chromis niloticus. 
tristramt. 
Synodontis schal. 
Citharinus geoffroti. 
Alestes rueppellir. 
Distichodus rudolphi, sp. nov. 
Barbus, sp. 
It is a noteworthy fact that five of these species belong to the 
fauna of the Nile, although they are by no means limited to that 
river, having been found in various other parts of Tropical Africa. 
Chromis tristrami (or Acerina zillii, Gerv.) has been described from 
fresh and saline waters of the oases of the Sahara; and Distichodus 
rudolphi is closely allied. to the Nilotic D. rostratus. The other 
species enumerated in the following list were obtained en route to 
Lake Rudolf or on the return journey, in various localities which 
will be indicated under the head of the several species. 
1. Ponyprnrus BIcHIR, Geoffr. 
Two young specimens from Lake Rudolf, both belonging to the 
variety with ten spines which also occurs in the Upper Nile and 
West Africa. 
2. CHRomIs NILOTICUS, Hasselq. 
Of this widely distributed species, the Bolti of the Nile, three 
specimens were in the collection. 
a. One from Lake Abeia, 24 cm. long; its scales are somewhat 
fewer in number than in typical specimens, viz. 27 along the 
lateral line. D. ie 
b. One from Lake Stephanie, 16 cm. long. The teeth of this 
specimen are equally small, as in the preceding specimen, but fewer 
in number, possibly owing to its younger age and less advanced 
growth of the jaws. D. ie 
c. A young specimen from Lake Rudolf, 10 cm. long. D. 2, 
3. CHROMIS TRISTRAMI, Gthr. 
Specimens from Lake Rudolf cannot be distinguished from the 
types which were obtained in the oases of the Hastern Sahara. 
The teeth of this species are much broader and larger than those 
of the preceding species. 
a. A rather large specimen, but with the hinder part of the 
body decomposed, from Lake Rudolf (12.8.95). D. 2. 
6. Another obtained in a dry watercourse, some 10 miles from 
Lake Rudolf (16,8.95), 15 cm. long. D. i 
