224 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



the fish bears the name generally given to Lahiobarhus throughout 

 Thailand, pla sa. 



LABIOBARBUS SPILOPLEUKA (H. M. Smith) 



Figure 40 



Dangila spilopletira Smith, 1934b, p. 307, pi. 10 (Menam Ohao Phya, Menam 



Taeliiu, Menam Nakon Nayok). 

 Dangila siamensis Fowler, 1934a, p. 115 (Nakon Sritamarat, Bangkok, Chieng- 



mai, Chiengsen) ; 1935a, p. 114, figs. 48-51 (Khao Nam Poo) ; 1935b, p. 510 

 (Old Chiengsen) ; 1937, p. 177 (Bangkok, Mepoon, Pltsanulok, Kemarat). 



At the time this species was described seven specimens besides the 

 type were available for examination : The type came from Hangkra- 

 ben, a stream celebrated for the abundance of fishes and the impor- 

 tance of its commercial fisheries, lying off the Chao Phya Kiver north 

 of Ayuthia; six specimens came from Klong Don Lao, also a cele- 

 brated fishing ground tributary to the Tachin River ; and one speci- 

 men came from the Nakon Nayok River, all these rivers being in 

 communication through canals. No other specimens have been met 

 with, although the species is probably not rare, and on the Tachin 

 River it is known to fishermen and dealers by a distinctive vernacular 

 name. 



Figure 40. — Labiobarbus spilopleura (H. M. Smith). Drawn by Luang Masya; courtesy 



of the Thailand Government. 



The principal characters are the rather elongate form (depth of 

 body 3.6 times in standard length), 44 scales in the lateral line, 7.5-1- 

 7.5 scales in the transverse line from midline of back to midline of 

 abdomen, 6 scales between the lateral line and the base of the ventral 

 fin, 20 scales around the narrow part of the caudal peduncle, the maxil- 

 lary baibel more than twice the length of the rostral barbel, and 1.5 

 times the diameter of the eye, dorsal fin with 25 branched rays, of 



