in length. Rostro-dorsal profile slightly convex to nape, from 

 there to snout declivous, the head being somewhat depressed. 

 Eye nearly 4 to 5 in head, nearly twice to more than 2.5 

 times in postorbital part of head and 1.4 to 1.6 in interorbital 

 space, which is flat and goes about 2.7 to 2.8 in length of 

 head. Maxillary extending about to frontborder of eye. Origin 

 of dorsal nearer to base of caudal than to head, opposite to 

 1 8 th or 19 th lateral scale and separated by about 29 praedorsal 

 scales from snout. Median dorsal rays produced, reaching base 

 of caudal or nearly so. Anal in its posterior third with a basal 

 sheath of 2 irregular rows of scales, anteriorly with four basal 

 scales between the succeeding rays. Its rays gradually incre- 

 asing in size till the last three and reaching on caudal, which 

 is rounded. Pectorals shorter than head without snout. Height 

 of caudal peduncle at base of caudal about half length of head. 

 Olivaceous or brownish, lighter below, a more or less distinct 

 lighter lateral band; a blackish spot at the base of the caudal. 

 Fins dusky, the median fins with blackish points on the fin- 

 membrane. Length 82 mm. [Type of the species seen by us]. 



Nom. indig. : Matje and Lewut (River Howong); Usang 

 (River Kajan). 



Habitat: Borneo (River Howong!, River Kajan, River 

 Bongon). 



3. Betta fusca Regan. 



Betta fnsca Tate Regan, Proc. Zool. Soc. London 1909, p. 780. 



D. 8 9; A. 2. 21 24; P. 13; V. 1.5; L.I. 29 32 ; L.tr. 9 V 2 . 



Rostro-dorsal profile more or less convex, head pointed. 

 Height 3.2 3.8; head 2.7 3 in length. Eye thrice or more 

 in head, its diameter conspicuously longer than snout, about 

 1.5 in postorbital part of head and somewhat more or less 

 than 1.2 in interorbital space, which goes 2.4 2.9 times in 

 length of head. Maxillary extending to below posterior nostril. 

 Origin of dorsal midway between head and base of caudal, 

 opposite to 14^ or i6 th lateral scale and separated by 22 -26 

 praedorsal scales from snout. Longest, median dorsal rays not 

 reaching caudal. Anal with a basal sheath of a single regular 

 series of rather large scales or some smaller ones may be 

 interpolated. Penultimate anal rays produced, reaching halfway 

 caudal, which is rounded and has the central rays produced. 

 Pectorals equal to or somewhat shorter than head. Height of 



