220 
head 6'/, 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 '/, 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.). 
Silurus mononema Bleeker, Verh. Bat. Gen. XXI. 1, 1847. Nieuwe Bijdr. Silur. 
Java, p. 8. 
Aryptopterus mononema Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 287. 
Atl. Ichth. Il. 1862, p. 87. 
Cryptopterus mononema Giinther, Cat. Brit. Mus. V. 1864, p. 39. 
By 10-11; Ds 25A> 76-—7o: P.M ni Neo: 
Elongate, dorsal profile nearly straight. Nape of the neck 
slightly concave. Height 5'/,, head 7?/;, eye about 4, situated 
behind the cleft of the mouth, its lower half below the level, 
about 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). 
