246 
1. Chaca chaca (Ham. Buch.). 
Platystacus chaca Hamilton Buchanan, Fishes of the Ganges, 1822, p.p. 140, 173. 
Chaca Jlophioides Valenciennes, in Bélanger, Voy. Ind. Orient. Zool. Poiss. 
1834, p. 386. 
Chaca lophioides Cuvier & Valenciennes, Hist. Nat. Poiss. XV. 1840, p. 545. 
Chaca bankanensis Bleeker, Natuurk. Tijdschr. Ned. Ind. III. 1852, p. 455. — 
Atl. Ichth. II. 1862, p. 96. 
Chaca lophioides Kner, Sitzber, Akad. Wien, XVII. 1855, p. 101. 
Chaca lophioides, bankanensis, buchanani Giinther, Cat. Brit. Mus. V. 1864, p. 29. 
Chaca bankanensis vy. Martens, Exp. Ost-Asien, Zool. I. 1876, p.p. 302, 399. 
Chaca bankanensis Volz, Zool. Jahrb. Syst. XIX. 1903, p. 383. — Revue Suisse 
Zool. XII. 1904, p. 463. 
B. 6; D. 1. 3—4; A. 7—10; P. 1. 4—5; V. 6; C. 20—25 + 
Io—I11 + 8—12. 
Height about 6. Head a little longer than broad, 3 times 
in length. Eye in the anterior '/, of the head, very small, 
15—20 in head. The width of the interorbital space equals 
half of the head. Dorsal spine 5—6 times in length of head, 
its frontborder at the top with a few indentations, much 
shorter than soft rays. Rounded ventrals 2'/, in head. Pectorals 
about '/, shorter, their spine 3 times in head, strongly dentated 
along its anterior border. The cutaneous appendages on top 
and sides of head and on sides of body are, according to 
individuals and perhaps to sex, tubercular, shorter or longer, 
simple or arborescent. Lighter or darker brownish, marbled 
with lighter, especially on the fins, which may have a whitish 
border. Length 200 mm. 
Nomen indig.: Puting bliong (Djambi), Tuka (Danau 
Sriang, Borneo). 
Habitat: Sumatra (Djambi!, Laut Tador, Sungei Mati, 
Indragiri, Djapura, Taluk!); Borneo (rivers Barito and Kapuas, 
Danau Sriang, Sarawak); Banka. — Malacca, Burmah and British 
India. — Kner mentions the fish from New Guinea. This is 
without question erroneous. 
In rivers and lakes. Its flesh is considered to be poisonous 
by the natives in some parts of Sumatra. 
5. Fam. PANGASIDAE. 
Elongate, compressed, head generally covered by soft skin. | 
Mouth small, anterior or subanterior, in the last case snout 
prominent. Eye with a free orbital margin, behind corner of 
