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. io ii. A. 103 105. P. i. 1516. V. 8. 

 Height 5'/2 6 , head 7 7'/ 4 , eyes subcutaneous, 56, 

 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 ! / 5 

 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. io 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. 

 n anterior, n' posterior nostril. 5 / 6 n. s. 



