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middle of the length of the head, twice in snout and 2.5 to 

 more than 3 times in interorbital space. Snout obtusely pointed, 

 prominent, with groups of larger and smaller pores from its 

 tip to frontborder of eye. Mouth inferior, of moderate width. 

 Lips moderately thick, fringed, with a very distinct inner fold 

 above and below. Rostral barbels longer or shorter than maxil- 

 lary barbels, not much shorter or longer than eye. Origin of 

 dorsal opposite to 9th scale of lateral line, separated by about 

 25 scales from occiput. Dorsal concave, the anterior rays much 

 longer than head. Anal with the anterior rays strongly prolonged, 

 reaching on caudal, its height less than that of dorsal, but 

 longer than head, its origin opposite to 27* — 28tb scale of 

 lateral line and behind dorsal. Ventrals and pectorals subequal 

 or the ventrals much longer and reaching with the outer 

 prolonged rays far on anal. Origin of ventrals opposite to 14th 

 scale of lateral line and the 4th branched dorsal ray, separated 

 by 6 scales from lateral line. Pectorals longer than head. 

 Caudal deeply emarginate, lobes pointed or rounded, much 

 longer than head. Least height of caudal peduncle 1.6 — 1.7 

 in length of head, about equal to length of the peduncle, sur- 

 rounded by 21 or 22 scales. Dark violet, each scale with a 

 round golden spot, more or less conspicuous in preserved 

 specimens. Fins black. Length 600 mm. 



Nom. indig. : Millem (Malay, Batavia); Arenjan (Sundan.); 

 Sihitam or ikan itam (Sumatra). 



Habitat: Sumatra (Muarah-Kompeh, Palembang!, river 

 Lematang ilir: Benakat, river Kwantan, river Batang Hari: 

 Djambi!); Java (Batavia, Bekassi, Krawang, Tjampea, Parong- 

 kalong, Tjikao, Surabaya, Gempol); Borneo (river Kapuas). • — 

 Siam. 



2. Subgenus Labeo Cuv. s. str. 

 Key to the ind o-a ustralian species. 



1. Linea lateralis 40 or more. 



a. Snout with a lateral lobe; 4 barbels . . . . Z. (L.) crythropterus p. 2I2. 



b. Snout without lateral lobe, 2 rostral barbels 



only L. (L.) moHto^-ella p. 2 1 3. 



2. Linea lateralis less than 40. 



a. Snout with a lateral lobe I*. (L.) rohiloides p. 214. 



/'. Snout without a lateral lobe Z. (L.J pkurotaenia p. 215. 



