392 BULLETIN 18S, UNITED STATES NATIONAL MUSEUM 



Herre and Myers (1937), besides recording specimens from Joliore, 

 Malacca, and Perak, apparently the first citations for Malaya, had 

 one specimen from the market in Singora, probably caught in the 

 Tale Sap, Peninsular Thailand. 



This is a small species, possibly not much exceeding a length of 

 15 cm. 



Genus HETEROBAGRUS Bleeker 



Heterohagrus Bleekee (337), Versl. Meded. Akad. Wet. Amsterdam, vol, 16, pp. 

 354, 355, 1864. (Type, Eeteroiagrus bocoiirti Bleeker.) 



HETEROBAGRUS BOCOURTI Bleeker 



Heterohagrus bocourti Bleekkr, 1864 (337), p. 355 (Siara) ; 1865 (347), p. 34 

 (Siam) ; 1865 (356), p. 175 (Siam).— Bocoukt, 1866, p. 19, pi. 1, figs. 1, la, lb 

 (Bangkok).— Sauvage, 1881, p. 162 (Siam). 



Prajadhipokia rex Fowler, 1934b, p. 339, figs. 3, 4 (Bangkok) ; 1935a, p. 106 (cited 

 as synonym of Heterohagrus bocourti) ; 1937, p. 152 (cited as distinct from 

 H. bocourti). 



Heterohagrus bocourtii Fowler, 1937, p. 150, figs. 48-51 (Pitsanulok). 



This striking fish, peculiar to Thailand, collected by Bocourt from 

 the Menam Chao Phya at Bangkok in 1861-2, was made the type of a 

 new genus and new species by Bleeker in 1864 but it was not actually 

 described until 1866, when Bocourt published a very full generic and 

 specific account from the manuscript furnished by Bleeker. 



For about 60 years after the fish was first collected and made known 

 to science it did not figure again in zoological literature. It was re- 

 discovered by the writer, who in 1923 found it abounding in parts 

 of the Menam Chao Phya between Paknampo and Bangkok and 

 in the Menam Sak below the barrage at Dha Luang. It was first 

 recorded from the Menam Mun near Korat, Eastern Thailand, in 

 1926, and 10 years later was collected by de Schauensee in the Menam 

 Nan near its mouth at Pitsanulok. During a number of years the 

 fish was found to be very abundant at Lopburi. 



The type specimen was 23.5 cm. long, which seems to be about the 

 maximum length attained by the species. 



Color note based on numerous living specimens from the Lopburi 

 River October 22, 1926. General color of head, back, and side bronze, 

 belly golden, a narrow dark longitudinal stripe in the bronze color of 

 the side ; a rounded blackish area larger than eye on lateral line imme- 

 diately behind the head, the area divided by a vertical crescentic or 

 lunular area of glistening white and the part of the spot anterior to the 

 white area more intense than that posterior thereto ; dorsal and ventral 

 fins green, blood-red at base and with dusky area on interradial mem- 

 branes ; adipose fin green ; caudal fin blackish green ; pectorals green, 

 with blood-red base. 



