FRESH-WATER FISHES OF SIAM, OR THAILAND 147 



CYCLOCHEILICHTHYS REPASSON (Bleeker) 



BarMs repasson Bleekee, 1853 (76), p. 295 (Panguabang, Sumatra). 

 Cyclocheiliclitlins repasson Wedeb and de Beaufort, 1916, vol. 3, p. 160 (Siam). — 

 FowuJB, 1937, p. 186 (Tachin, Mepoon, Pitsanulok). 



The range of this species covers Java, Borneo, Sumatra, and Thai- 

 land. It is widely distributed in Central Thailand (Menam Chao 

 Phya and tributaries, Meklong), Northern (Mekok at Chiengrai), and 

 Peninsular Thailand (upper Tapi, Tale Sap, and Patani River). 



The prominent distinguishing features are strongly arched dorsal 

 profile, deep body (about 2.6 times in standard length), flat inter- 

 orbital space exceeding diameter of eye, 4 small barbels, postlabial 

 groove on lower jaw not interrupted medianly, 7 scales above lateral 

 line and 4 below lateral line to base of ventral, 20 scales around the 

 narrowest part of caudal peduncle, very strong osseous fourth simple 

 dorsal ray, origin of dorsal fin nearer to base of caudal than to tip of 

 snout, conspicuous longitudinal black stripes formed by spots on the 

 scales, and a large round black spot on the caudal peduncle. 



While in the Dutch East Indies the fish reaches a length of 28 cm., 

 the largest met with in Thailand have been only 16 cm. long. 



CYCLOCHEILICHTHIS DUMERILII Sauvage 



Cyclocheilichthys (CyclocheilichtJiys) dumerili Bleekee, 1865 (347), p. 37 

 (nomen nudum) (Siam) ; 1865 (356), p. 175 (nomen nudum) (Siam). 



CyclocheiUchthys dunierilii Sauvage, ISSl, pp. 163, 182 (Banglvolv). — Hora, 1923b, 

 p. 154 (Bangkok, Nontaburi). — Fowler, 1937, p. 188 (Bangkok, Mepoon, 

 Tachin, Kemarat). 



In the Pakret section of the Menam Chao Phya this fish was very 

 common in December 1924, the bulk of the cast-net catch at that time 

 consisting of it and C osmochilus harmandi Sauvage, 



The type was 16 cm. long. The largest fish observed in recent years 

 were 18.5 cm. long. 



While this species has sometimes been ascribed to Bleeker, it was 

 first described by Sauvage in 1881, 16 years after Bleeker had thus 

 labeled a specimen in the Paris Museum collected at Bangkok by Dr. 

 Bocourt. 



Fowler (1937), in referring to numerous specimens in his posses- 

 sion from Central and Northern Thailand, was in error in stating 

 that "this interesting species does not seem to have been seen since 

 originally described in 1881." In addition to the specimens from the 

 Menam Chao Ph3^a at Bangkok and Nontaburi examined by Hora 

 (1923b), the fish has been collected for the Siamese Bureau of Fish- 

 eries at various places in the Menam Chao Phya between Bangkok 

 and Ayuthia, and also in the Samrong Canal (connecting the Menam 

 Chao Phya with the Menam Bangpakong) . 



