209 



> 



to the second ] J 5 of the anal, mandibulary barbels nearly as 

 long as the head. Height of dorsal a little more than postor- 

 bital part of head, its distance from the snout about 2 times 

 in its distance from the caudal. Last ray of anal connected 

 with the base of the caudal, which is superficially emarginated, 

 its lobes rounded, the upper one the longer. Ventrals below 

 or a little before dorsal. Pectorals rounded, as long as head, 

 with a slender smooth spine, the osseous part of which is 

 shorter than the postorbital part of the head. Vomerine teeth 

 in two oval separate patches, bands of fine pointed teeth in 

 jaws, curved backwards, the hindmost the shortest. 8 short 

 widely set gillrakers, much shorter than branchial filaments. 

 Brownish, underside and fins lighter. A blackish spot behind 

 the gillopening and a dark band through base of caudal 

 sometimes visible. Length 190 mm. 



N o m e n i n d i g. : Da won bambu (Benkulen). 



Habitat: Sumatra (Benkulen, Taluk!, Laut Tador, river 

 Kwantan, Indragiri, Upper Langkat, Djambi!); Banka; Borneo 

 (Serawak). 



In fresh water. 



2. Callichrous bimaculatus (Bl.). 



Silurus bimac^^lat^ls Bloch, Ausl. Fische VIII. 1794, p. 24. 



Callichrous bimaculatus Bleeker, Atl. Ichth. II. 1862, p. 84. (see syn.). 



Callichrous bimaculatus Giinther, Cat. Brit. Mus. V. 1864, p. 45. 



Callichrous bimaculatus Day, Fishes of India 4. 18781888, p. 476. 



Callichrous bimaculatus Vinciguerra, Ann. Mus. Civ. Gen. 2 Ser. IX. 1890, p. 201. 



Callichrous bimaculatus Volz, Revue Suisse de Zool. XII. 1904, p. 465. 



Ompok bimaculatus Jordan & Scale, Proc. U.S. Nat. Mus. XXXIII. 1938. p. 536. 



B. 1213; D. 4; A. 2. 577 2 ; p - i- 1214; V. 78. 



Height 4 4^, head 4*/ 2 4 3 / 4 . Eye 5 ! / 2 /'/a* its anterior 

 border above the corner of the mouth, i 1 2 / 3 in snout, 

 2'/ 2 to more than 3 '/ a apart. Lower jaw 

 strongly prominent. Praedorsal profile 

 sloping nearly in a straight line, profile 

 of the head concave. Maxillary barbels 

 extending to the middle of the pectorals Fig. 83. 



or to the anal. Mandibulary barbels a Callichrous bimaculatus (Bl.). 

 little longer or shorter than the eye. Teeth of u PP er J aw and 

 Height of dorsal % of height of body, pal 



its distance from the snout about twice in its distance from the 

 INDO-AUSTRAIJAN FISHES II. 14 



