218 



with a slight concavity in the nape of the neck to the snout. 

 Height s'/a 4 ! /2> head 5 2 / 3 6'/ 2 , eye about 2V 2 3 situated 

 behind the cleft of the mouth, nearer to the lower profile of 

 the head, longer than snout, iV 2 times in the strong con- 

 vexity of the interorbital space. Maxillary barbels reaching to 

 ventrals or to anal, those of the mandibles - - if present - 

 rudimentary and far behind symphysis. Dorsal a little before 

 origin of ventrals. Anal free from caudal. Ventrals nearly as 

 long as the eye. Pectorals much longer than head, the osseous 

 part of their spine somewhat shorter than head. Caudal deeply 

 incised. Teeth in the jaws in a narrow crescentic band, those 

 on the vomer in a more or less oval patch. Gillrakers 15. 

 Colour yellowish, dorsal surface of head and back, pectorals, 

 distal part of anal and hindborder of caudal blackish. A violet 

 spot above the pectorals. Length 170 mm. 



Nomen indig. : Limpok (Mai. Batav.), Padgiat, Mahor 

 (Serawak). 



Habitat: Java (Batavia, Gempol); Sumatra (Padang, Palem- 

 bang, Lahat, Djambi!); Borneo (rivers Kapuas, Barito, Maha- 

 kam!, Sambas, Baram, Serawak). Siam. 



The locality "Amboina" for C. amboinensis Gthr. is cer- 

 tainly erroneous. 



In fresh water. 



4. Cryptopterus lais (Blkr.). 



Silurus lais Bleeker, Nat. Tijdschr. Ned. Indie II. 1851, p. 428. 

 Kryptopterichthys lais Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 291. 



Atl. Ichth. II. 1862, p. 88. 



Cryptopterus lais Giinther, Cat. Brit. Mus. V. 1864, p. 42. 

 Cryptopterus lais von Martens, Exp. nach Ost-Asien, Zool. Bd. I. 1876, p. 399. 



Differs from the preceding species, according to Bleeker 

 and Giinther, by its longer maxillary barbel, reaching to or 

 surpassing the middle of the anal, by the more concave 

 profile of its neck and by the stronger convexity of its back. 

 Perhaps it belongs to C. bicirrhis. Length, 125 mm. [Type 

 in the Leyden Museum, in very bad state, examined]. 



Habitat: Borneo (rivers Sambas, Barito, Kahajan, Danau 

 Sriang). 



5. Cryptopterus Cryptopterus (Blkr.). 



Silurus Cryptopterus Bleeker, Nat. Tijdschr. Ned. Indie I. 1851, p. 270. 

 Kryptopterus microptis Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 284. 

 Atl. Ichth. II. 1862, p. 86. 



