261 
blackish. Underside of head and fins reddish. Distal part of 
caudal, ventrals, pectorals and dorsal blackish. Marginal part 
of anal with a dark hue. Length 440 mm. 
Habitat: Sumatra (Taluk!). 
In rivers. 
7. Pangasius micronema Blkr. 
Pangasius micronemus Bleeker, Verh. Bat. Gen. XXI. I. 1847, Nieuwe Bijdr. 
Silur. Java, p. 8. 
Pangasius rios Bleeker, Nat. Tijdschr. Ned. Indié, II]. 1851, p. 205. — Atl. 
Ichth. II. 1862, p. 74. 
Pangasius micronema Bleeker, Atl. Ichth. Il. 1862, p. 75. 
Pangasius rios Giinther, Cat. Brit. Mus. V. 1864, p. 63. 
Pangasius micronema Giinther, Cat. Brit. Mus. V. 1864, p. 63. 
Pangasius rios Vaillant, Nouv. Arch. Mus. Hist. Nat. (3) V. 1893, p. 71. 
Pseudolais tetranema Vaillant, Notes Leyden Mus. XXIV. 1902, p. 29. (young 
specimen, type examined). 
Pangasius rios Popta, Notes Leyden Mus. XXVII. 1906, p. 28. 
Baro 9D), 7 AS 28— 445 Pe ria) VEG: 
Elongate, compressed, dorsal profile nearly straight behind 
dorsal, sloping down in a straight line before dorsal to the 
blunt, rounded, prominent snout. Mouthopening subterminal, 
semicircular, rather small. Distance between corners of mouth 
about 2—2'/, in length of head. Height behind dorsal more 
than 4, head a little more or less than 5, covered by smooth 
skin above. Maxillary barbels originating behind the corner 
of the mouth, hidden in a slit, which is continued under the 
eye, shorter than half head; mandibulary ones a little less than 
'/, of head. Eye 4—5, behind the corner of mouth and partly 
below it, about 3'/, times in the very convex interorbital 
space, about 2'/, times in the ventral distance. Osseous part 
of dorsal spine, which is of moderate strength and serrated 
behind, somewhat shorter than head without snout, adipose 
fin about equal to eye, above the beginning of the last '/, 
of the anal. Anal 33/,—4 in length. Ventrals far distant from 
anal, about half length of head. Pectorals scarcely shorter 
than head, their spine somewhat shorter, serrated behind. 
Villiform teeth in the jaws in rather narrow bands, that of 
the lower jaw more curved. Teeth on vomer and palatines 
in four longish patches, arranged in a crescent. Margaritaceous, 
upper surface dark, fins yellowish, distal part of caudal, dorsal 
and sometimes nearly the whole pectorals blackish. Length 
over 500 mm. 
