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called by the natives "Ikan depeq". They are not seen during 

 the north eastern tradevvinds, but only during the dry season 

 and even then they appear only in great numbers during the 

 "depeq"-winds, which are blowing with great strength during 

 a few hours. Such depeq-winds, during which the depeq-fishes 

 appear, are blowing in the dry season (April — October), about 

 4 — 6 times in each month. Nothing is said about 3 other 

 fishes, 58 — 66 mm. which carry the name: "Ikan relo", from 

 the same lake, which belong without question to the same 

 species. Our opinion is that these are the representatives of 

 three generations of the same species. It may be that they 

 are living in deeper water and that at least the ikan depeq 

 is forced to come to the surface in consequence of the depeq- 

 winds. 



4. Rasbora leptosoma (Blkr.). 



Leuciscus leptosoma Bleeker, Nat. Tijdschr. Ned. Indie IX. 1855, p. 269. 

 Rasbora leptosoma Bleeker, Ichth. Arch. lad. Prodr. II. Cyprini, i860, p. 446. — 



Atl. Ichth. III. 1863, p. 123. 

 Rasbora leptosoma Giinther, Cat. Brit. Mus. VII. 1868, p. 196. 



ii 



D. 2.7; A. 3.5; P. 1. 13; V. 2.7; L. 1. 31 — 32; L. tr. ^. 



3 

 Height about 4.3, more than 5.5 in length with caudal. 



Head 4.5 — 4.6, almo.st 6 in length with caudal. Eye thrice, 

 longer than snout and about equal to interorbital space. Notch 

 on the border of the upper lip very deep, receiving the strongly 

 developed symphysial knob. Origin of dorsal before the middle 

 between snout and root of caudal, separated from occiput by 

 12 or 13 scales. Dorsal truncate, its height about equal to 

 that of the body, much nearer to ventrals than to anal. Anal 

 slightly concave, its height about one third less than that of body. 

 Ventrals not or scarcely reaching anal, pectorals not reaching 

 ventrals. Caudal deeply incised, longer than head. Least height 

 of caudal peduncle more than twice in its length. Seven rows 

 of scales between the lateral lines, counted over the back of 

 the middle of the caudal peduncle. Colour of alcohol specimens 

 brownish, with a faint silvery band along the sides. Length 

 94 mm. [Specimens of Bleeker seen by us in the Leyden 

 Museum]. 



Habitat: Sumatra (Lahat!; Indragiri ? according to VOLZ, 

 Revue Suisse de Zool. XII. 1904, p. 479, but he is not sure 

 about his determination). 

 Indo-australian fishes III. 5 



