344 MB. F. DAT ON THE GEO&BAPHICAL 



the Jumna, and Upper Assam. This genus possesses an adhesive 

 thoracic sucker, as in the last. 



25. PsEiJDECHENEis, M'Olelland. Head waters of the Ganges 

 and on the Himalayas, also the Khasya hills. Fishes of this 

 genus have a very well-developed adhesive sucker on the chest, 

 composed of transverse folds of skin. 



26. ExosTOMA^ BlytJi. Head waters of Indus, along the Hima- 

 layas and hilly districts to Assam, Pegu, Tenasserim, and the 

 confines of China. Although these fishes have no adhesive sucker 

 on their tuberciilated chest, it is flattened, while the pectoral and 

 ventral fins are evidently adapted for adhesion. 



Examining the foregoing genera composing the freshwater 

 Siluroids of India, we find that, of the 26 genera, 10 reach the 

 Malay archipelago, 6 are restricted to India on the west, 6 to 

 India and Burma, whilst Eretliistes extends to China, Saccolran- 

 chus to Cochin China ; and Glarias ranges from Africa, through 

 Syria and India, to the Malay archipelago and beyond. 



In short, out of 26 genera, 11 have Malayan and Chinese repre- 

 sentatives, whilst only 1 has African ; and this genus is common to 

 the Malay archipelago. 



I will now follow out the geographical distribution of each 

 species, so far as such have been as yet recorded or have fallen 

 under my own observation. 



Genus Macrokes. 



1. Maceones chetsetjs. Bay. Eivers in Canara and Ma- 

 labar. 



2. M. AOR 2^ Hamilton Buclianan. Throughout the fresh waters 

 of Sind, India, Assam, and Burma. 



3. M, seenghaxa', SyTces. Sind, Salt range of Punjaub, the 

 Jumna and Ganges rivers, certainly as low as Delhi ; the Deccan 

 and Kistna river to its termination. 



4. M. Bltthii *, Day. Tenasserim. 



5. M. Guno ^, Hamilton Buchanan. This is the only Indian 

 species of this genus recorded as from the sea ; it frequents estu- 



^ Includes Chimarrichthys, Sauvage. 



* Includes : — 1 Bagrus aorimis, Val.; B. aorides, Jerdon. 



^ Includes ; — Bagrus Lamarrii, Cuv. & Val. ; B. aorellus, Blyth. 



* Includes Batasio affinis, Blyth. 



" Includes : — Bagrus albilabriis, fuscus, Birmannus, and abbreviatus, Out. & 

 Val. ; £. gulioides, melas, Schlegelii, and rhodopterygius, Bleeker. 



