FRESH-WATER FISHES OF SIAM, OR THAILAND 395 



by Deignan at Ta Ta Fang, on the Salwin in Western Thailand, Octo- 

 ber 13, 1936, have been compared with and found to agree with speci- 

 mens in the U. S. National Museum from the Irrawaddy at Mandalay, 

 collected by Fea and reported on by Vinciguerra (1889-90, p. 249). 

 Adult fish, which reach a length of 30 cm., have a plain grayish body 

 color with the distal part of the dorsal, adipose, anal, ventral, and pec- 

 toral fins black and the caudal whitish. In the young in hand there 

 are four dark dorsal blotches, which extend on the side below the 

 lateral line, the adipose fin has a sharply defined black edge, and each 

 caudal lobe has at its base a black oblique stripe extending outward 

 from the apex of the fork. 



Genus OREOGLANIS H. M. Smith 



Oreoglanis H. M. Smith, Journ. Siam Soc, Nat. Hist. Suppl., vol. 9, p. 70, 1933. 

 (Type, Oreoglanis siamensis H. M. Smith.) 



OREOGLANIS SIAMENSIS H. M. Smith 



Oreoglanis siamensis Smith, 1933a, p. 70, fig. 4, pi. 3 (Mekang) ; 1934b, p. 293 

 (Melao). 



The type locality for this interesting species is the Mekang, a clear, 

 cold swift stream on Doi Angka tributary of the Meping. A Karen, 

 living in a village on the stream, with a cast net caught the first speci- 

 mens, in company with small serpentheads {Ophicephalus gachua 

 Hamilton), in December 1928. The type and paratype are 7.1, 9.1, 

 and 10.8 cm. long, taken from the same place in September 1935, and 

 a single specimen, 5.1 cm. long, the smallest example known, collected 

 June 8, 1935, by A. E. Buchanan in Huey Um Meng, a swift brook 

 tributary to the Mechem, which is an afiluent of the Meping. 



When the Harvard Primate Expedition visited Doi Angka in April 

 1937, the fish was again met with, and six specimens 7.8 to 12.1 cm. 

 long were preserved and have been examined. 



The only other known specimen came from the Melao, a tributary of 

 the Meleng, which flows into the Meping; it was taken with a cast 

 net in December 1932, in company with 9 or 10 species of small fishes, 

 and came from a point 725 meters above sea level, where the Melao 

 was a swift brook. 



The Melao specimen, caught shortly before dusk, was kept alive in a 

 wicker basket and examined the next morning. It was found to be 

 almost uniformly olive-green above, fleshy pink below, with a creamy- 

 white ovate spot on the back on each side of the base of the dorsal fin. 

 From an account of the fish published in 1934 (Smith, 1934:b) , the fol- 

 lowing extract is made. In its normal resting attitude, the fish kept 

 its adhesive apparatus in action even in water having no current. It 



