other by about their own length and contiguous with the lateral 

 patches, which are about twice as broad as long, the whole 



forming one rather narrow, inter- 



^T/VVg ''"'*'' 't! 9 .?/' ^7?V rupted, arcuate band. About 10 stiff, 



flattened gillrakers, the longest about 

 3 / 4 of branchial filaments and shorter 

 than the eye. Brownish above, whitish 



Fig. 117. Arius JA> (Blkr.) below, fins yellowish, base of pec- 

 Teeth of upper jaw and palate Vi- . i L T i 



torals bluish. Length over 500 mm. 



Nomen indig. : Ikan dukang (Palemb.). 

 Habitat: Sumatra (Palembang, Djambi!); Borneo (Banjer- 

 massin !). 

 In rivers. 



13. Arius carinatus M. Web. 



Arius carinatus Max Weber, Nova Guinea IX. livr. 4. 1913, p. 537- 



B. 6; D. I. 7; A. 1416; P. I. 10; V. 6. 



Elongate; height under dorsal spine 4 3 / 4 5 ! / 2 , 4 J / 3 to 

 almost 5 before that spine. Head 4 4 2 / 3 , its width i J / 4 i 1 ^ 

 in its length, its profile ascends steeply, in full grown speci- 



Fig. 1 1 8. Arius carinatus M. Web. nat. size. 



mens nearly in a straight line from snout to dorsal. This line 

 is the more convex in its posterior half, the younger the 

 specimens are. Headshields rugose, when older granular. Occi- 

 pital process scarcely longer than broad at its base, sharply 



