146 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



Northern Thailand, of whicli the excellent series of this species forms 

 a part. 



CYCLOCHEILICHTHYS ENOPLOS (Bleeker) 



Figure 20 



Barbus enoplos Bleeker, 1850 (25), p. 16 (Kalimas River, Surabaya, Java). 

 Cyclocheilichthys nuicracanthtis Bleeker, 1865 (347), p. 35 (Siam) ; 1865 (356), 



p. 175 (Siam). 

 Cyclocheilichthus enoplos Weber and de Beaufort, 1916, vol. 3, p. 158 (Siam). — 



Fowler, 1935a, p. 121 (Bangkok) ; 1937, p. 184 (Bangkok). 



The range of this species covers Java, Sumatra, and Thailand. It 

 is known from the entire length of the Menam Chao Phya, the Pasak 

 and other lar^e tributaries, and the Meklong. 



Figure 20. — Cyclocheilichthys enoplos (Bleeker). Drawn by Nai Chote Suvatti; cour- 

 tesy of the Thailand Government. 



It is the largest member of the genus. A length of 45 cm. is at- 

 tained in Sumatra, and examples of that size are not uncommon in the 

 Menam Chao Phya. A specimen -taken in the head of that river at 

 Paknampo January 7, 1925, was 57 cm, long. 



What may be regarded as typical specimens have all the lateral-line 

 tubes bifid. There is considerable variation in this character, how- 

 ever. Some examples may show only a single scale with a bifid tube, 

 and some may have the bifid tubes only or mostly on the anterior 

 scales. In two specimens 22 cm, long taken by me in the Menam Chao 

 Phya at Nontaburi on December 28, 1925, some of the tubes were bifid 

 and some trifid. 



It is called pla takok throughout its local range. 



This fish is considered excellent eating. 



