209 
to the second '/, 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. 
Nomen indig.: Dawon 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 bimaculatus 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°. 1878—1888, 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 & Seale, Proc. U.S. Nat. Mus. XXXIII. 1938. p. 536. 
B. 12—13; D. 4; A. 2. 57—72; P. 1. 12—14; V. 7—8. 
Height 4—4'/,, head 4'/,—4°/,. Eye 5'/,—7'/,, its anterior 
border above the corner of the mouth, 1—1?/, in snout, 
2'/, to more than 3'/, 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 Ca/lichrous bimaculatus (Bl.). 
little longer or shorter than the eye. mec SS Tae 
Height of dorsal ?/, of height of body, Bee os oo 
its distance from the snout about twice in its distance from the 
INDO-AUSTRALIAN FISHES II. 14 
