212 



top of the snout. Posterior nostrils short tubes far behind 

 and above the eye. Maxillary barbels very slender, flexible, 

 reaching the eye. Mandibulary barbels far distant from sym- 

 physis, about equal to half of eye, hairlike and scarcely 

 visible. Anal very long, free from caudal. Ventrals reaching 

 the vertical through third anal ray. Pectorals reaching the 

 vertical through fifth or sixth anal ray, a little shorter than 

 head, osseous part of their spine longer than half of head. Fine, 

 curved teeth in curved bands in the jaws, those on the vomer 

 in two very small rounded patches, covered by the strongly 

 developed velum. Gillrakers 10, the longest nearly equalling 

 the branchial filaments. Shiny pearl-colour, dark greyish above. 

 Fins bordered with dark. Length 375 mm. 



Nomen indig. : Belut tulang (Djambi). 



Habitat: Sumatra (Palembang, Djambi!), Borneo (Sintang, 

 riv. Kapuas, riv. Bunut !). 



In rivers. 



3. Hemisilurus moolenburghi n. sp. 



B. ii; A. 90 93; P. i. 15 16; V. 9. 



Height 4 3 / 5 5 ! / 3 , head 5 5 ! / 3 , eyes subcutaneous, 7 8, 

 situated in the anterior half of the head, their distance from 

 the end of the snout goes i 2 / 3 1 ! / 2 times in the postorbital 

 part of the head, their diameter about 2 ! / 3 in the snout and 

 3 to nearly 4 times in the convexity of the interorbital space. 



Fig. 84. Hemisilurus moolenburghi n. sp. 



Snout rounded or slightly pointed, very prominent before the 

 mouthopening, which is nearly transverse and inferior. Dorsal 

 profile ascending from the snout to the convex back, anteriorly 

 slightly concave. Anterior nostrils tubular, situated at the top 

 of the snout, posterior nostrils bordered by a superior and 

 inferior lip, behind and above eye. Maxillary barbels situated 

 laterally and behind anterior nostrils, originating from a rounded 

 base, in the male rounded, stiff in the proximal part, distally 



