Dr. A. Gunther on Indian Fishes. 139 



ginate. Pectoral fin extending a little beyond the origin of 

 the dorsal, with a strong non-serrated spine ; ventrals reaching 

 the vent Head greyish, minutely punctated with black. 

 Trunk black anteriorly, the black colour being contracted into 

 an irregular band, which runs along the middle of the posterior 

 part of the trunk and of the tail. Dorsal fin black, with 

 whitish margin; caudal and pectoral fins punctulated with 

 black. 



Two specimens, 45 millim. long, from Tenasserim ; pre- 

 sented bv J. Wood-Mason. Esq. 



Erethistes, M. & Tr. 



= Hara, Blyth. 



The diagnosis of these supposed two genera were given in 

 the i Catalogue of Fishes,' from the descriptions published by 

 their authors. These descriptions have proved to be incom- 

 plete or faulty, and the two genera to refer to the same fish. 

 The amended characters will be as follows : — 



Two dorsal fins, the anterior with a strong spine, the pos- 

 terior adipose and rather short ; anal short. Teeth in both 

 jaws minute ; palate edentulous. Mouth small, at the lower 

 side of the conical snout. Barbels eight : nasal barbel very 

 small, attached to the flap covering the posterior nostril ; basal 

 fringe of the maxillary barbels short. Anterior and posterior 

 nostrils close together. Eyes small, without free orbital edge. 

 The superficial bones of the head with granular surface, 

 forming a strong armature ; humeral processes elongate, pro- 

 tecting each side of the abdomen. Ventral fins six-rayed, 

 inserted below the dorsal. Gill-membrane confluent with the 

 isthmus opposite to the root of the humeral process. 



These characters are taken from specimens of Erethistes 

 hara. The genus is most closely allied to Callomystax. 



Olyra, McCl. 



This genus was known to me, at the time of the publication 

 of the fifth volume of the c Catalogue of Fishes/ from McClel- 

 land's description only. The British Museum has now re- 

 ceived specimens through the kindness of Mr. Wood-Mason, 

 which enable me to amend the diagnosis of the genus, as well 

 as to insert it into its proper place in the system proposed by me. 

 The genus* belongs to the group Silurina; and I should be 



* Branchios'eus, if entitled to generic distinction, would, of course, 

 follow Olura. 



10* 



