BEM 
Nomen 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. Indié, III. 1852, p. 94. 
Bagrus poecilopterus Bleeker, Nat. Tijdschr. Ned. Indié, V, 1853, p. 445 (nec. 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, p. 548. 
Beg i077; AL 516; (Po 1.383" Vs. 0. 
Height 5'/,—6; head 3?/,—3°/,, 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 or operculum, 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, 17/,—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. 
