On a new Genus of Salmonoid Fishes, 329 



In the female the ventral area of the third segment is 

 raised behind the sternal piece to which the legs are articu- 

 lated, into a convexly margined plate. In the male the distal 

 segment of the copulatory organ arises on the inner surface of 

 the apex of the basal segment, and is curved inwards to meet 

 its fellow of the opposite side, the two then running forwards 

 closely in contact with each other, the apex being curled 

 ventrally and very slightly bifid. 



(3) CyUndrodesmus viUosus, sp. n. 



Colour of adult a pale yellowish brown, the sixth segment 

 of the antennas infuscate ; the forehead 

 darker than the lower part of the head. 



The female of this species differs in 

 scarcely anything, so far as I have noticed, 

 from C. hirsutus ; but the male may be at 

 once recognized from the male of hirsutus 

 and of Struhelli by the form of the copu- 

 latory organ, which ends in two subsimilar 

 ventrally turned branches, of which the 

 proximal is much shorter than the distal. 



Length of female up to 6'd millim. 



The males of the three known species may be recognized as 

 follows : — 



a. Apex of copulatory organ simple or very slightly 

 divided ; leugtli 7-8 millim. 

 a}. Apex of the copulatory organ bent ventrally 



and weakly bitid hirsutus, Poc. 



(Christmas Island.) 

 h^. Apex of copulatory organ undivided and bent 



dorsally Struhelli (Verb.). 



(Amboiua.) 

 h. Copulatory organ ending distally in tn'o subsimilar 

 branches directed ventrally ; length up to b\ 



millim viUosus, sp. n. 



(Rotuma.) 



LIV. — On a new Genus of Salmonoid Fishes from the 

 Altai Mountains. By G. A. BOULENGER, F.R.S. 



A SINGLE example of a remarkable Salmonoid from the south 

 side of the Altai Mountains, on Chinese territory, was 

 brought home by Mr. St. George Littledale from his recent 

 expedition, and presented by him to the British Museum. 

 The specimen was unfortunately dried, and reached the 

 Ann. & Mag. N. Hist. Ser. 7. Vol. i. 25 



