347 



Height below dorsal spine 3'/ 4 3 4 / 5 , head 5 7, eye 5 8. 

 Barbels shorter than head, longer and broadened in the males. 

 Dorsal acute, its first ray much longer than height of body, 

 its flattened spine still higher, according to age. Adipose fin 

 contiguous to dorsal and more than 4 times longer than it. 

 Pectoral spine strong, its hindborder conspicuously serrated, 

 shorter or somewhat longer than head. Darkish brown, belly, 

 a dorso-ventral and a dorso-anal band lighter. Lateral line a 

 narrow white band. Caudal and posterior end of adipose fin 

 yellowish. Length more than 400 mm. 



N o m e n i n d i g. : Ikan lalajang (Djambi). 



Habitat: Sumatra (Palembang, Rokan river!, Djambi!); 

 Borneo (Sintang) '). 



In rivers. 



3. Bagroides Bleeker. 



(BLEEKER, Nat. Tijdschr. Ned. Indie, II. 1851, p. 204). 



More or less elongate and robust. Head covered by thick 

 skin, snout conical, prominent, mouthopening rather small, 

 transverse, with thick lips. Occipital process touching the basal 

 bone of the dorsal spine. Eye covered by skin. 8 barbels. 

 Short dorsal with a strong pungent spine, its hindborder with 

 teeth directed upward. A long or very long adipose fin, totally 

 adnate to the back or with the hindborder free. Origin of 

 ventrals before or below origin of adipose fin. Anal with less 

 than 20 rays. Pectorals with a strong pungent spine, serrated 

 behind. Caudal deeply forked. Small teeth in more or less 

 curved bands in the jaws, on the vomer in a curved band or 

 in a semioval patch. Gillmembranes totally united, free from 

 isthmus, with or without a shallow notch behind. Branchioste- 

 gals 78. 



Synopsis of the species. 



1. Adipose fin about as long as the head; vomerine 



teeth in a semioval patch {Bagroides Blkr.) B. melapterus p. 348. 



2. Adipose fin twice as long as the head; vomerine 

 teeth in a short, curved, uninterrupted band (Pseudo- 

 bagrichthys Blkr.). 



i) The locality n China" (Karoli Janos, Termeszetrajzi fuzetek, V. 1882, p. 32) 

 is probably erroneous. 



