76 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



u feAv specimens from widely separated localities. Four specimens 

 collected in (he Tale Noi, September 28, 1927, agree well with the 

 descriptions of Bleeker and of Weber and de Beaufort, except that the 

 origin of the dorsal fin is a little farther in advance of the anal than 

 shown in Bleeker's plate. A specimen, 15.5 cm. long, taken in the 

 Chantabun River, May 25, 1925, has the origin of the dorsal fin very 

 slightly in advance of that of the anal. 



A length of 20 cm. is attained by the species in the East Indies. 



O. anomalura is the genotype of Oxygaster. The species is the only 

 one mentioned in the description of the genus and is clearly entitled to 

 recognition over Leuciscus oxygaster^ described by Cuvier and Valen- 

 ciennes more than 20 years later. 



OXYGASTER SIAMENSIS (Gunther) 



Chela siamensis Gunther, 1868, vol. 7, p. 336 (Pacbebou). 



Parulaubttca siamensis Sauvage, 1881, p. 164 (Pacbebon) ; 1883b, p. 153 (Menam 



Chao Pbya). 

 Oxygaster siamensis Fowler, 1935a, p. 110, fig. 44 (Bangkok). 



The type of this species, 4 inches long, collected by the celebrated 

 traveler and explorer Mouhot, is in the British Museum; it was ob- 

 tained at Pachebon, or Pechabun, a town on the upper Pasak River, 

 on the eastern confines of Central Thailand. The British Museum has 

 three other specimens from the Siamese Museum collected in the upper 

 Bangpakong River, in the southeastern part of Central Thailand. 

 Sauvage listed the species from the "Menam." One other specimen, 83 

 mm. long, taken at Bangkok, was cited by Fowler, whose description 

 is in none too exact agreement with Gunther 's. 



OXYGASTER OXYGASTROIDES (Bleeker) 



Leuciscus oxugasiroides Bleeker, 1852 (55), p. 431 (Prabukarta, Borneo; Palem- 

 bang, Sumatra; Batavia). 



Chela oxygastroides von Martens, 1876, p. 403 (Bangkok). — Webek and de Beau- 

 fort, 1916, vol. 3, p. 51 (Siam).— HoRA, 1923b, p. 152 (Bangkok) ; 1924a, p. 469 

 (Tale Sap). 



Oxygaster oxygastroides Fowler, ]93r)a, p. 110 (Bangkok) ; 1937, p. 167 (Mepoou, 

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



In the Indo-Australian Archipelago this is a common fish in Java, 

 Borneo, and Sumatra. It is the outstanding species of Oxijgastev in 

 Thailand, widely distributed and in places abundant. In Central 

 Thailand, the fish has been collected in the Menam Chao Phya through- 

 out its length from Bangkok to Paknampo; in the Menam Nan near 

 Paknampo; in the Menam Sak at Dha Luang; in the Menam Bang- 

 pakong; and in the Meklong at Rajaburi. In the Peninsular region it 

 has been taken in Klong Sao Tong, Nakon Sritamarat; in the Tale 

 Sap ; in the Tale Noi ; and at Krabi. In the Tale Noi the fish is very 



