339 



edge. Ventrals not quite reaching the anal. Caudal forked. 

 Caudal peduncle i' 2 / 3 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. Ill (2), 1846, 

 p. 151. Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 161. 



Hypselobagrus micracanthtts Bleeker, All. Ichth. II. 1862, p. 59. 



Macrones micracanthus Giinther, Cat. Brit. Mus. V. 1864, p. 76. 



Macrones micracanthtts Stein dachner, Abh. Senckenb. Naturf. Gesellsch. XXV. 

 1901, p. 446. 



Macrones bimaculatus Volz, Revue Suisse de Zool. XII. 1904, p. 466. 



B. 9; D. II. 7; A. II 12; P. I. 89; 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 i ! / 3 

 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*/ 2 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 3 /4 m 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 (bimaculatus 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 



