FRESH-WATER FISHES OF SIAM, OR THAILAND 



229 



four times or a little more in the standard length as compared with a 

 head 4.7 to 5.2 times in the length in Z. leptocheiliis. This difference 

 was insisted on by Bleeker and is well shown in the plates in his Atlas. 



Genus AMBLYRHYNCHICHTHYS Bleeker 



ArnblyrJiynchichthys Bleeker (261), Nat. Tijdschr. Nederl. Indie, vol. 20, p. 430, 

 1859. (Type, Barhus truncntus Bleeker.) • 



AMBLYRHYNCHICHTHYS TRUNCATUS (Bleeker) 



Figure 41 



Barbus truncatus Bleeker, 1851 (26), p. 13 (Bandjermassing, Borneo). 



AmltlyrTiynchichthys truncatus Bleeker, 1865 (356), p. 176 (Siam). — Weber and 

 de Beaufort, 1916, vol. 3, p. 105 (Siam).— Hora, 1923b, p. 153 (Bangkok).— 

 Fowler, ll»34a, p. 115 (Chiengsen) ; 1937, p. 174 (Bangkok, Mepoon, Kema- 

 rat) ; 1939, p. 44 (Krabi). 



AmUyrhynchithys truncatus Sauvage, 1883b, p. 152 (Menam Chao Phya). 



This species, occurring in Borneo and Sumatra, is fairly common in 

 streams in Central Thailand. It has been noted in the Menam Chao 

 Phya from Bangkok to Paknampo, in the lower Menam Nan and Bung 

 Borapet, in the Menam Pasak at Dha Luang, and in the Meklong at 

 Kajaburi. The only record of the fish in Peninsular Siam is for the 

 Tapi River near Bandon, where the writer collected a number of speci- 

 mens in September 1923. More recently H. W. Fowler reported the 

 fish from the Mekong at Kemarat. The British Museum contains a 

 number of specimens from tlie Menam Chao Phya, gift of the Siamese 

 Museum. 



Figure 41. — Amblyrhynchichthys truncatus (Bleeker). Drawn by Nal Chote Suvatti; 

 courtesy of the Thailand Government. 

 590087—45- 16 . 



