198 
frontborder of the snout, more approximated than the posterior 
nostrils, which are valvulated, looking upwards, near the ver- 
tical through the frontborder of the eye. Maxillary barbels 
laterally from anterior nostrils, extending to the middle of the 
anal. Mandibulary barbels at some distance behind symphysis, 
extending on the first '/, of the anal. Origin of dorsal nearly 
opposite to ventrals; its height about equal to postorbital part 
of head. Anal confluent with caudal, which goes nearly 2'/, times 
in length of body, and is superficially and asymmetrically incised, 
with the lower lobe much shorter than the upper. Ventrals 
reaching on anal, 1'/, times in head. Pectorals about equal to 
head, their spine much shorter. Minute teeth in a curved band 
in the jaws, those of the vomer in one very small median 
patch. Brown above, distal part of caudal, of pectorals and 
anal somewhat darker, barbels sometimes with dark brown 
rings. Length 140 mm. 
Habitat: Sumatra (Taluk! Bagan api api!); Singapore; 
Banka; Biliton; Borneo (Sambas, Kahajan, Danau_ Sriang, 
Sarawak). — Malacca. 
In_ rivers. 
Doubtiulsspceves: 
1. Silurichthys hasseltii Blkr. 
Silurichthys Hasseltii Bleeker, Ichth. Arch. Ind. Prodr. I Siluri, 1858, p. 270. — 
At alchth- lle nS62s5p.o2- 
Silurichthys Hasseltii Vaillant, Nouv. Arch. du Museum, (4) v. 1893, p. 62. 
The type from Tjisekat, Java, examined by us in the Leyden 
Museum, differs from the preceding species by the more 
anterior position of the dorsal, which is situated in advance 
of the ventrals as also stated by Bleeker and by Vaillant. 
It is doubtful as is also expressed by Vaillant, that on this 
character alone a new species can be founded. 
2. Silurichthys schneideri Volz. 
Silurichthys Schneideri Volz, Revue Suisse Zool. XII. 1904, p. 463. 
D. 4; AMIGA RP ST UOLD NGE 7 
Height 6'/, times in total length (without caudal). Length 
of head 7'/, in same length. Upper and lower jaw equal. Gape 
of mouth reaches laterally nearly vertically below frontmargin 
of eye. The eye is small, its diameter only '/, of total length 
