Mouth inferior, its cleft small, curved, its frontborder with a 

 thick lip, continued round its corners. Jaws with a hard, blunt 

 cutting-edge. Two pairs of barbels in front of snout and one 

 at each angle of the mouth. Dorsal and anal short, the former 

 opposite to ventrals, which are horizontal even as the pectorals, 

 the outer rays of which are simple. Ventrals with 8 12 rays. 

 Caudal more or less emarginate or deeply forked. Scales small, 



Fig. 3. Homaloptera erythrorhina (C. V.) X 9 /io- 



wanting in smaller or greater extent on abdomen. Lateral 

 line present. Gillopenings narrow, above and before base of 

 pectorals. Gillmembranes united with isthmus. No pseudo- 

 branchiae. 



Distribution: Fresh water, especially mountain streams 

 of indo-australian Archipelago (Sumatra, Java, Borneo) and 

 south eastern part of continental Asia. 



Artificial key to the indo-australian species 

 of Homaloptera. 



I. Origin of dorsal behind origin of ventrals (Homa- 

 lopter aides Fowler). 



1. Lateral line 43 47. 



a. Dorsal nearer to caudal than to snout. Cau- 

 dal deeply emarginate H. wassinki p. 9. 



b. Dorsal in middle between caudal and snout. 



Caudal slightly emarginate H. ocellata p. 10. 



2. Lateral line 60 or more. 



a. Lower surface partly scaly. 



