370 



barbels scarcely reaching opercles. Occipital process slightly 

 longer than broad at its base, its top truncate or emarginate, 

 its sides parallel. Median fontanel reaching to base of occipital 

 process. Height of dorsal less than twice its length, about 

 equal to height of body, its spine of about the same height and 

 1 2 / 3 1 3 / 5 in length of head. Height of anal less than height 

 of body, slightly more than its length, more than twice shorter 

 than adipose fin. Ventrals obtuse, about twice shorter than 

 pectorals. Pectorals acute, slightly shorter than head, their 

 strong spine curved, longer than the dorsal one, in the middle 

 of its length provided with some teeth. Caudal truncate with 

 acute angles, 6 2 / 3 in length. Yellowish brown above, dark brown 

 below, fins yellowish brown, densely reticulated. Length of 

 single specimen known 1 10 mm. [After Bleeker, not seen by us]. 

 Habitat: Sumatra (Palembang). 



Doubtful species. 



Acrochordonichthys pachy derma Vaillant, Notes Leyden Mus. XXIV. n. I 3, 



1902, p. 66. Borneo (river Bluu). 

 Sosia chamaleon Vaillant, Notes Leyden Mus. XXIV. n. I 3, 1902, p. 82, 



Borneo (river Kapuas, river Mandai, river Sibau). 

 Acrochordonichthys obscurus Popta, Notes Leyden Mus. XXIV. n. 4, 1904, 



p. 187. Notes Leyden Mus. XXVII. 1906, p. 55. Nomen indig. : Putero, 



Borneo (river Bongan). 

 Acrochordonichthys buttikoferi Popta, Notes Leyden Mus. XXIV. n. 4, 1904, 



p. 1 88. Notes Leyden Mus. XXVII. 1906, p. 58, Borneo (rivers Bongan 



and Bo). 

 Acrochordonichthys varius Popta, Notes Leyden Mus. XXIV. n. 4, 1904, p. 189. 



Notes Leyden Mus. XXVII. 1906, p. 63, Borneo (river Bo). 



We believe that the above named species, examined by us 

 in the Leyden Museum, belong to A. melanogaster or are only 

 local or colour-varieties, though their median fontanel is far 

 distant from the base of the occipital process, at the base of 

 which lies a separate small hollow. It may be that Bleeker 

 has overlooked the fact that these fontanels are separated. 



2. Akysis Bleeker. 

 (BLEEKER, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 234). 



Head broad, depressed, covered by soft skin, body tapering 

 behind. Skin covered with roundish granules. Belly flattish. 

 Eyes small, looking upward, covered by skin. Anterior nostril 



