KUNGL. SV. VET. AKADEMIENS HANDLINGAR. KAM) 47. \ <> 6. 



39 



Total length of the largest of these specimens without caudal 22—23 cm. but 

 larger specimens attaining a length of 30.7 em. (or with middle rays of caudal in- 

 cluded 33. t cm.) were caught in Thika river at Blue Post. 



Botjlenger has recorded this species from: Niro Narok River system flowing 

 into Lorian Swamp, and Upper Athi River, British East Africa.» 



Barbus ahlselli n. sp. 



Depth of body 3 3 /s to 3 4 /-. times in total length without caudal; length of head 

 about 3 'A» times. Snout 3 to 3 74 times in length of head, eye about 4 times in 

 length of head interorbital width nearly 4 times in head. Lips well developed, low er 

 continuous across the chin. Posterior barbel about 1 1 /z diameters of eye, anterior 



Fig. 5. Barhus ahlselli n. sp. 



about as long as eye (shorter in young). Dorsal III 9 (8), equally distant from occiput 

 and root of caudal, börder concave, last simple ray a strong spine, but not serrated, 

 nearly as long as depth of body but a little shorter than length of head. Anal III, 

 5, nearly reaching 1 caudal. Pectorals shorter than head, not reaching ventral. Base 

 of ventral behind the origin of dorsal; caudal peduncle not quite 1 */« times as long 

 as deep. Scales longitudinally striated 25 (26). Four and a half scales between lateral 

 line and origin of dorsal; two scales between lateral line and root of ventral, 12 scales 

 round caudal peduncle. Caudal deeply cleft. 



This fish is related to Barbus krapfi in several respects but differs by its much 

 longer head which is longer than the greatest depth of the body, lesser height of 

 body, and by its longer dorsal spine (or ossified last simple ray of dorsal). 



Of this kind only two specimens were obtained together with a lot of B. luazo- 

 melop (see below) from Luazomela river, a tributary to Guaso Nyiri from the south. 



I take the pleasure of naming this species for my friend Rudolf Ahlsell Esq. 

 who in a very generous manner subsidized the Expedition. 



1 By mistake a little too short in the tigure. 



