193 
occipital process 4—5. Its greatest breadth midway between 
eyes and posterior part of opercles, equal to head. Eyes 12—14. 
Eye distance as long as or a little longer than mouthopening, 
nearly as long as head without snout. Occipital process trian- 
gular, its top rounded, not very prominent, its height nearly 
3 times in its base. Occipital fontanel '/, shorter than the 
frontal one, the frontborder of which reaches about a line 
through the hindborder of the eyes. Surface of head, if gra- 
nular, very inconspicuously so. Nasal barbels extending to hind- 
border of head or surpassing it, maxillary barbel nearly reaching 
ventrals, mandibulary barbel extending to about the extremity - 
of pectorals, mentals much shorter. Distance between origin 
of dorsal and occipital process 2'/, times in the distance from 
lastnamed to snout. The rounded caudal is free from dorsal 
and anal. Ventrals rounded extending on anal, ?/, length of 
pectorals, more than twice in head. Pectorals rounded, shorter 
than postorbital part of head, their spine not very strong, ?/, of 
longest rays, smooth. Teeth small, acute. In the maxillary 
arranged in two bands, broadened a little laterally, half as 
long as broad. The mandibulary teeth in two contiguous 
quadrangular patches, with the posterior exterior corner late- 
rally produced. Vomerine teeth in a semicrescentic band. 13 
gillrakers, shorter than branchial filaments. Uniform brown or 
blackish; belly, underside of head, barbels on underside, 
ventrals and pectorals whitish. Pectorals and barbels sometimes 
more or less dark coloured, body and tail often with light 
spots, more or less regularly arranged in transverse lines. 
Median fins more or less distinctly bordered with white. 
Length 330 mm. 
Habitat: Sumatra (Benkulen, Ringat! Siboga, Djambi!); 
Banka; Nias; Borneo (rivers Kajan, Mahakam, Kahajan, Kapuas, 
Sambas, Sarawak, Baram and Balikpapan!). 
Doubtful. species. 
1. Clarias macrocephalus Max Weber, Ergebn. einer Reise 
in N. O. Indien, Bd. III 1894. p. 419. (Pajakomboh, Sumatra). 
The specifical value of the specimens named C. macroce- 
phalus Gthr. by Max Weber is even now doubtful, as Clarzas 
macrocephalus Gthr seems to be a rather doubtful species. 
The Pajakomboh specimens agree with C/. datrachus, but are 
distinct by their long and strong pectoral spine, which is 
INDO-AUSTRALIAN FISHEs II, 13 
