NOTES ON FISHES FROM THE ATHI RIVER IN 

 BRITISH EAST AFRICA 



BY CARL L. HUBBS 



A small collection of fishes was obtained in the Athi River by the 

 Museum's East African Expedition of 1905-7. Among them three 

 species of Barbus cannot be identified with any of the known forms and 

 are described as new. These "Athi River fishes were all collected at 

 one time and place, at low water (dry season) in pools at a point about 

 25 miles S. E. of Nairobi, and perhaps 10 miles from the Uganda Rail- 

 way (north). They were taken, with a small seine, about November," 



I905. 1 



In addition to these fishes an adult eel (Anguilla bengalensis) "was 

 taken on a hook and line in the Tana River about 35 miles S. E. of 

 the summit of Mt. Kenia." 1 



Labeo cylindricus Peters. 



Boulenger, Cat. Fresh-water Fishes Africa, 1, 1909, pp. 331-333, 

 text fig. 



Our 32 specimens (Cat. No. 6107), varying in length from 29 to 97 

 mm., agree in their characters with Tylognathus montanus Gunther, 

 which Boulenger considers to be based upon half grown specimens of 

 L. cylindricus. At this stage the species in all details closely resembles 

 the adult of Labeo victorianus. In our largest specimen, however, the 

 differential growth of the head has already proceeded in the direction 

 of the peculiar adult physiognomy: the eye is inserted superolaterally, 

 is located a little behind the middle of the head, and is decreased in 

 proportionate size, being contained 6.0 times in the head; the production 

 of the antorbital portion of the face is already in process, the suborbital 

 having become wider than the orbit, but still remaining narrower than 

 the interspace between the eye and the upper angle of the branchial 

 aperture. 



Scales in 5^, 6, or 6> rows above the line, and in 6> or 7^ rows 

 between the lateral line series and the midabdominal line. The varia- 



1 Quoted from letter by Carl E. Akeley, who had charge of the expedition. 



9 



