FRESH-WATER FISHES OF SIAM, OR THAILAND 205 



of difference mentioned by Fowler are the black ends of the caudal 

 lobes, the uniform coloration, and the ventral fins nearly reaching anal 

 fin in A. sumatranus, whereas in L. hutchiiisoni the ends of the caudal 

 lobes are not black, the scales of the back and sides have a narrow, dark 

 basal crescent, and the ventrals extend about two-thirds of the distance 

 to the anal fin. It may be pointed out, however, that the caudal lobes 

 do not always have black ends in A. sumatranus, as Dr. de Beaufort 

 stated in a letter and as specimens collected by the writer show ; and 

 the length of the ventrals in the Thai specimens at hand varies with 

 sex and size. In the figure of L. hutchinsoni a large, round, sharply 

 defined black spot on the middle of the anal fin is present. This is not 

 observed in the specimens under consideration, but Fowler's descrip- 

 tion does not mention this feature and reads: "Anal whitish, mem- 

 branes mediall}^ and anteriorly dusky to blackish." In a series of 17 

 specimens from a waterfall stream near Trang, Fowler (1939) found 

 none with the large black blotch on the anal fin as shown in the figure. 

 Vernacular names given to this fish are pla lourd on Kao Chong, 

 pla hae (probably a contraction of kahae) on Klong Tadi, pla hai at 

 Sichon, and p7a chae on Doi Hua Mot. 



ACROSSOCHEILUS DUKAI (Day) 



Barbus dukai Day, 1878, vol. 2, p. 564 (Darjeeling River, India) . 

 Barius (LissocMlus) dukai Hora, 1923b, p. 155 (Nakon Sritamarat mountains). 

 Lissochilus dukai Stjvatti, 1936, p. 55 (Nakon Sritamarat).— Fowler, 1937, p. 188 

 (Mepoon). 



With its wide distribution — India, Shan States of Burma, Malaya, 

 and probably Sumatra — the presence of this fish in Thailand is not 

 unexpected. Since the first specimens were recorded by Hora from 

 mountains west of Nakon Sritamarat, the fish has been collected in 

 various other mountain streams in the province of that name (south- 

 east of Tung Song, at Klong Chawang east of Bandon, at Sichon, and 

 at Kao Chong), in the Bajo waterfall stream in Patani, in Central 

 Thailand at Mepoon, and in Huey Melao, on Doi Hua ^lot, northern 

 region. The specimen taken at Huey Melao, 15.5 cm. long, was taken 

 August 23, 1934, at an elevation of 1,000 meters. Young specimens 

 have a conspicuous black spot at the base of the caudal fin. 



In Patani this fish is called pla tung nga. A local name in the Doi 

 Hua Mot region is pla pang chae. 



Genus BALANTIOCHEILOS Bleeker 



Balantiocheilos Bleekeb (261), Nat. Tijdsclir. Nederl-Indie, vol. 20, p. 430. 

 1859-60. (Type, Balantiocheilos melanopterus Bleeker.) 



