327 



a series of large spots along the side of the body. In the 

 interspaces between those spots there is more dorsally a 

 similar row of less dark spots, these two alternating rows of 

 spots covering almost the whole sides of the body and leaving 

 a light zic-zac lateral line between them. The centre of each 

 spot of the upper row is formed by a darker oblique streak, 

 which is at right angles with similar streaks on the ventral 

 half of the body. In older specimens the whole fish is much 

 darker and the markings on the body are more or less obso- 

 lete, the oblique streaks on the belly, which is lighter, remaining 

 more conspicuous, but often completely vanishing in old 

 specimens. Sometimes there are round black spots, irregularly 

 arranged, on upper part of head and body. Dorsal, anal and 

 caudal spotted or streaked with rows of blackish or whitish 

 spots. Similar spots are often conspicuous on the ventral 

 side of the head. Pectorals white, barred with brown; ventrals 

 freckled or indistinctly barred with brown. Length 360 mm. 



Nom. indig. : Gabus tjina (Malay Batavia), Mudju mudju 

 (Korintji, Sumatra). 



Habitat: Sumatra (Padang, Lake Singkarah !, Solok, Pa- 

 lembang!, Lahat, Taluk I, Muara Kompeh, Lower Langkat, 

 Laut Tador, Lake Korintji!, Indragiri, Ujapura, Djambi !, Deli) ; 

 13anka ; Biliton ; Singkep ! ; Java (Batavia, Bekassi !, Buitenzorg!, 

 Tjibiliong, Lelles, Semarang, Megamendok); Madura; Borneo 

 (river Kajan !, river Mahakkam and its affluents Howong !, Bluu !, 

 Bo!; Prabukarto, Banjermassin, river Kahajan, river Kapuas: 

 Pontianak, Sebruang, Knapei, Putus Genting and river Raun!; 

 Mandhor, Montrado, Sambas, river Baram, river Serawak). — 

 Siam, China. 



In rivers, lakes and ponds. 



Note. Opliioccphalns polylepis Blkr. is based on a single 

 young specimen of 1 14 mm., now preserved in the Leiden 

 Museum and in such a bad state, that it is impossible to des- 

 cribe it properly. According to Bleeker's description, the 

 only difference of importance between 0. polylepis and luciiis 

 would be that lastnamed species has one row of scales more 

 above the lateral line than 0. polylepis. In his diagnosis however 

 Bleeker states of the scales in the l.tr. ''quarum 4 vel 5 r 

 supra lineam lateralem." All the specimens afterwards labelled 

 by different authors as 0. polylepis and which we examined, 

 turned out to be 0. lucius. We have not seen the specimens 



