810 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Genus LEPTOBARBUS Bleeker 



Leptolarbus Bleeker, Ichth. Arch. Ind. Prodr., vol. 2, Cyprini, p. 432, 1860. 

 (Type, Barbus hocvenii Bleeker, monotypic.) 



Body oblong, elongate, abdomen rounded. Head broad, depressed. 

 Mouth slightly inclined, moderately wide, reaches nearly or to eye. 

 Jaws equal. Barbels 4, well developed, rostral pair and maxillary 

 pair at mouth corner. Preorbital nearly a pentagon. Gill open- 

 ings extending forward below preopercle. Gill rakers short, lanceo- 

 late, wide set. Pseudobranchiae present. Pharyngeal teeth spoon 

 shaped, 2, 3, 5-5, 3, 2, with masticatory margin pluricrenulate. 

 Scales moderate, nuchal begin before opercle end. Lateral line 

 curved down, extends somewhat along lower half of tail. Dorsal 

 fin short, with 7 or 8 branched rays, spines weak, without serrae, 

 origin slightly before ventral origin and base without scaly sheath. 

 Anal very short, with not more than 6 branched rays. 



Siam, Sumatra, Borneo. 



LEPTOBARBUS MELANOTAENIA Boulenger 



Leptobarbus melanotamia Boulenger, Ann. Mag. Nat. Hist., ser. 6, vol. 13, p. 

 249, 1894 (type locality: Bongon, North Borneo). — Popta, Notes Leyden 

 Mus., vol. 27, p. 150, 1906 (Bo, Borneo ) .—Webeb and Beaufort, Fishes 

 Indo-Australian Archipelago, vol. 3, p. 97, 1916 (northeast Borneo). 



Depth 3 to 314 ; head 3 to 3%, width ly^ to 21/2. Snout 3 to 31/5 

 in head; eye 3^^ to 5, 1 to 1% in snout, 1 to 2% in interorbital ; 

 maxillary reaches eye, length 2% to 2% in head; front barbel 3 to 

 4%o? hind barbel 1% to 2^5; jaws nearly even, or lower sometimes 

 scarcely longer; interorbital 1% to 3%, broadly convex; suborbitals 

 about half cover cheek to preopercle ridge in adult, in young cheek 

 largely naked, suborbital ridge quite narrow. Gill rakers 4 + 9, 

 short, slender points, 2% in gill filaments, which li/4 in eye. 

 Pharyngeal teeth 2, 3, 5-5, 3, 2, slightly hooked, with well developed 

 grinding surfaces. 



Scales 37 or 38 in lateral line to caudal base and 3 more on latter; 

 6 above, 3 below, 13 or 14 predorsal, 14 around caudal peduncle. 

 Scales with 40 apical radiating striae and 6 basal; circuli finely 

 concentric, incomplete apically. 



D. Ill, 7, I, first branched ray I14 to 1% in head ; A. in, 5, i, first 

 branched ray II/2 to 1% ; least depth of caudal peduncle 2 to 2I/2 ; 

 pectoral li/4 to V/2', ventral I14 to 1%; caudal 3l^ to 4 in rest of 

 body, well forked, lobes sharply pointed. 



Back and upper surfaces olive-brown, lower half of body whitish. 

 Blackish brown blotch, deeper than eye, in humeral region of gill 

 opening. At junctures of longitudinal row of scales close along 



