339 
edge. Ventrals not quite reaching the anal. Caudal forked. 
Caudal peduncle 17/, as long as deep. Brownish, fins dusky. 
Length 150 mm. |After Regan’s description, supplemented and 
altered by informations by letter]. 
Habitat: Borneo (Baram river). 
3. Macrones micracanthus (Blkr.) 
Bagrus micracanthus Bleeker, Nat. & Geneesk. Arch, Ned. Ind. III (2), 1846, 
p. 151. — Ichth. Arch. Ind. Prodr, I. Siluri, 1858, p. 161. 
Hypselobagrus micracanthus Bleeker, Atl. Ichth. II. 1862, p. 59. 
Macrones micracanthus Giinther, Cat. Brit. Mus. V. 1864, p. 76. 
Macrones micracanthus Steindachner, Abh. Senckenb. Naturf. Gesellsch, XXV. 
I9OI, p. 446. 
Macrones bimaculatus Volz, Revue Suisse de Zool. XII. 1904, p. 466. 
Bevo. SOs 7 Ae ti 123 Po 1.38—9;/ V..,.6. 
Oblong, dorsal profile elevated before dorsal, head somewhat 
flattened, snout rounded, slightly prominent. Mouthopening 
crescentic. Height 4—5, head about 4, its greatest width 1'/, 
in its length. A median groove in the anterior half of the head 
only, the upper surface of head finely rugose, as well as the 
slender occipital process, which reaches the interspinal bone of 
the dorsal. Eye 4'/,—5. Nasal barbels reaching frontborder of 
operculum, maxillary barbels reaching tail or caudal, mandibu- 
lary ones end of pectorals, mental ones extending on pectorals. 
Height of dorsal about */, in head, osseous part of spine less 
than half of head, serrated behind. Adipose fin much longer 
than dorsal and anal; more or less contiguous with dorsal by 
a low anterior part, which may rise gradually, immediately 
behind dorsal (é¢maculatus Volz), or forms a low ridge of 
some extent before rising. These two extremes are connected 
by transitions and their conspicuousness depends on the kind 
of preservation. Ventrals shorter than pectorals, which are as 
long as height of dorsal. The osseous part of their strong 
flattened spine, with the hindborder strongly serrated, is 
somewhat shorter, but much longer than dorsal spine. Villiform 
teeth, in the upper jaw in a slightly, in the lower jaw in a 
strongly curved band. The crescent-shaped band on the palate 
narrower than that of the jaws. Violet brown above, lighter 
below, fins brownish. A more or less conspicuous dark spot 
at base of caudal, preceded in the young by a white band 
encircling the caudal peduncle. A round black spot behind 
