220 



head 6 l / 2 or a little more. Eye about 3, about equal to snout, 

 situated behind the cleft of the mouth and partly below its 

 level, about twice in the convexity of the interorbital space. 

 Anterior nostrils tubular, near the end of the snout; posterior 

 nostrils at some distance behind. Jaws equal. Maxillary barbels 

 extending to the posterior '/ 4 of the anal, those of the man- 

 dibles at least to the end of the pectorals. Anal free from 

 caudal, ventrals much longer than eye. Pectorals extending 

 far on anal, much longer than head, their spine conspicuously 

 shorter than head. Caudal deeply bifurcated. Maxillary teeth 

 in a narrow curved band, equal to those of the mandibles. 

 Teeth on the vomer in a short straight band. Colour yellowish. 

 Length over 300 mm. 



Nomen indig. : Lee (Kajan), Leys (Koetei), Lais (Djambi). 



Habitat: Sumatra (rivers Mussi, Batang Hari !, Kwantan) ; 

 Borneo (rivers Mahakan, Kahajan, Kapuas, Baram and Sarawak). 



In fresh water. 



7. Cryptopterus mononema (Blkr.). 



Siturus mononema Bleeker, Verh. Bat. Gen. XXI. I, 1847. Nieuwe Bijdr. Silur. 



Java, p. 8. 

 Kryptopterus mononema Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 287. 



Atl. Ichth. II. 1862, p. 87. 

 Cryptopterus mononema Giinther, Cat. Brit. Mus. V. 1864, p. 39. 



B. 10 II; D. 2; A. 7679; P. I. 14; V. 8. 



Elongate, dorsal profile nearly straight. Nape of the neck 

 slightly concave. Height 5 J / 2 , head 7 2 / 5 , eye about 4, situated 

 behind the cleft of the mouth, its lower half below the level, 

 about 2 ! / 2 in interorbital space. Jaws equal. Maxillary barbels 

 extend to the second fourth of the anal, those of the mandi- 

 bles to the base of the ventrals. Anal free from caudal, which 

 is deeply incised. Ventrals three times shorter than pectorals, 

 which are longer than the head. Their osseous spine slightly 

 shorter than the head. Maxillary teeth in a small semilunar 

 band, those of the vomer in a short transverse slightly cur- 

 ved band. Colour above delute olivaceous, below margarita- 

 ceous. Fins hyaline, more or less powdered with black. Length 

 over 270 mm. [after Bleeker, not seen by us]. 



Habitat: Java (Surakarta) ; Sumatra (Deli). 



