214 
4. Hemisilurus scleronema Blkr. 
Hemisilurus scleronema Bleeker, Atl. Ichth. II. 1862, p. 93. 
Hemisilurus scleronema Vaillant, Notes Leyden Museum, XXIV. 1902, p. 29. 
B. 1017. A. 1031052 P: a. 15=—16.. Vi. 3: 
Height 5'/,—6, head 7—7'J,, eyes subcutaneous, 5—6, 
situated in the anterior half of the head, their distance from 
the end of the snout goes twice in the postorbital part of 
the head, their diameter nearly twice in the convexity of the 
interorbital space. Snout. obtuse, slightly prominent, anterior 
part of head flattish, almost horizontal, posteriorly slowly 
ascending to the convexity of the head. Anterior nostrils 
tubular, situated not far distant from each other at the top 
of the snout, posterior 
nostril bordered superi- 
orly and inferiorly by a 
lip, above the frontbor- 
der of the eye. Maxillary 
barbels stiff, situated la- 
terally of the anterior 
nostrils, originating from 
a rounded base broadly 
compressed, their point 
hooked. Mandibulary bar- 
bels far distant from sym- 
physis, minute, about '/, 
of eye-diameter. Anal 
ceases before caudal. Ventrals reaching the vertical through 
the third anal ray, pectorals about the sixth ray; lastnamed 
are rounded, a little shorter than head, the osseous part of 
their spine nearly equalling the postorbital part of the head. 
Fine villiform teeth in a band in the jaws, a few forming 
two separate patches on vomer. 10 gillrakers, the 4 hinder- 
most rather slender but shorter than branchial filaments. 
Margaritaceous, back somewhat dark. Caudal fin powdered 
with blackish, as also the border of the anal. Length 400 mm. 
Habitat: Java (Krawang); Borneo (rivers Kapuas and 
Baram); Sumatra (Djambi!). 
In rivers. 
Fig. 86. Hemisilurus scleronema Blkr. 
# anterior, 72’ posterior nostril. 5/, n.s. 
