357 



No men indig. : Klaso (Bongan). 



Habitat: Java (Batavia!, Buitenzorg) ; Sumatra (Solok!, 

 Djapura, Laut Tador, Indragiri, Upper Langkat, Deli); Borneo 

 (rivers Kapuas, Bongan, Bongon, Merabeh, Sarawak). Siam. 



In rivers. 



5. Leiocassis micropogon (Blkr.). 



Bagrus micropogon Bleeker, Nat. Tijdschr. Ned. Indie, III. 1852, p. 94. 

 Bagrus poecilopterus Bleeker, Nat. Tijdschr. Ned. Indie, V, 1853, p. 445 (nee. C. V.). 

 Leiocassis micropogon Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 142. 



Atl. Ichth. II. 1862, p. 53. 



Liocassis micropogon Giinther, Cat. Brit. Mus. V. 1864, p. 89. 

 Liocassis micropogon Vinciguerra, Ann. Mus. Civ. Genova XVI. 1880, p. 171. 

 Liocassis micropogon C. Tate Regan, Ann. Mag. Nat. Hist. (8) XI. 1913^.548. 



B. 910; D. I. 7; A. 1516; P. I. 8; V. 6. 



Height 5*/ 2 6; head 3 2 / 5 3 3 / 4 , rather broader than high, 

 its depth being one half of its length, covered with soft skin. 

 Occipital process about as long as eye, its distance from basal 

 bone of dorsal spine much more than its own length. Eye 

 6 8, according to age more or less than 2 times in the pro- 

 minent, convex snout, which is longer than the interorbital 

 space. Barbels variable in length, the nasal ones reaching to 

 eye or farther, the maxillary ones to eye oroperculum, the man- 

 dibulary ones shorter, the mental ones still shorter. Height of 

 dorsal not or scarcely more than height of body, its spine, the 

 hindborder of which is weakly serrated, i 2 / 3 2 in head. Adipose 

 fin more than twice as long as dorsal, the distance between 

 both is more than half the length of the adipose fin. Base of 

 rounded anal shorter than that of adipose fin. Pectoral spine 

 slightly longer or shorter than that of dorsal, strongly serrated 

 behind. Caudal deeply forked. Maxillary teeth in a slightly 

 curved band, that of the palate and lower jaw strongly curved. 

 Brownish, with irregular dark cross-bands; a brown lateral 

 band running from the head to the caudal; fins with one or 

 two brown bands. Length to about 200 mm. [Typical specimens 

 of Bleeker's collection in the Leyden Museum seen by us]. 



Nomen indig.: Ikan tugok (Sarawak). 



Habitat: Sumatra (Palembang, Lahat, River Kwantan and 

 Mahe, Upper Langkat, Deli); Banka; Biliton; Borneo (River 

 Kapuas, Sambas, Sarawak). - - Malacca. 



In rivers. 



