356 



BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



Phya, During the next 40 years the species received no notice. In 

 November 1923 the writer found the fish fairly common in the upper- 

 most reaches of the Menam Chao Phya and preserved 6 specimens 

 about 25 cm. long. In 1928 he observed the fish in the Menam Nakon 

 Nayok, a branch of the Bangpakong connected by canals with the 

 Menam Chao Phya, and preserved 2 specimens. More recently addi- 

 tional specimens have been obtained by the Siamese Bureau of Fisheries 

 from the Paknampo section of the Menam Chao Phya. 

 This species was placed by Hora in his genus Platytropius. 



Figure 80. — Platytropius siamensis (Sauvage). Drawn by Luang Masya; courtesy of 



the Thailand Government. 



The Indian fish Pseudeutvoyius taahree, (Sykes) was improperly 

 listed by the Avriter (1934b, p. 297) as occurring in Thailand on the 

 basis of a specimen so labeled in the British Museum collected in the 

 Menam Chao Phya and donated by the Siamese Museum in 1897. 

 This specimen was examined by Hora and found to be P. siamensis. 



Fowler's N emasilwroides furcatus, based on four specimens, 10.3 to 

 11.5 cm. long, collected in Bangkok, appears to be the present species. 

 The genus Nemasiluroides^ described as new in May 1937, seems to 

 have been anticipated by Hora's Platytropius^ briefly diagnosed and 

 type species indicated in January 1937, but with full description not 

 appearing until November 1937. 



Genus EUTROPIICHTHYS Bleeker 



Eutropiichthys Bleeker (299), Versl. Akad. Amsterdam, vol. 14, p. 398, 1862. 

 (Type, Pimelodus vacha Hamilton.) 



EUTROPIICHTHYS VACHA (Hamilton) 



Pimelodus vacha Hamilton, 1822, pp. 196, 378 (Gangetlc provinces). 

 Eutropiichthys vacha Hora, 1937b, p. 436, fig. 5a (Siam). 



This widely distributed species of India and Burma was added to 

 the Thai fauna in 1932, when a specimen, 31 cm. long, collected by 



