FRESH-WATER FISHES OF SIAM, OR THAILAND 83 



Paralcmbuca is very close to Cultrops of H. M. Smith and may prove 

 to be identical, in which case the name would replace Cultro'ps. The 

 general appearance of typical Pardlaubuca differs from that of Cul- 

 trops siamensis (Hora), and there seem to be certain definite char- 

 acters by which the genera may be separated, as indicated in the fore- 

 going key. It should be pointed out, however, that one of these char- 

 acters — the bipartite swim bladder in Paralaubuca — has not been veri- 

 fied for all the species herein placed in that genus. The Thailand 

 species are distinguished as follows : 



la. Scales in lateral line less than 50 (46) ; scales in transverse series between 

 midline of back and lateral line 8 ; predorsal scales 36 ; gill rakers on lower 



arm of first arch 18; branched anal rays 28 barroni 



1&. Scales in lateral line 50 to 66 ; scales in transverse series between midline of 

 back and lateral line 11 to 14 ; predorsal scales more than 40 ; gill rakers 

 on lower arm of first arch 27 to 33 ; branched anal rays 25 to 30. 

 2a. Scales in lateral line 62 to 66; scales between lateral line and base of ven- 

 tral fin 3 ; predorsal scales about 45 ; origin of dorsal fin nearer to eye 

 than to base of caudal fin ; origin of anal fin well behind last dorsal rays ; 



pectoral fin with large blackish or dark area stigmabrachium 



26. Scales in lateral line 50 to 60 ; origin of dorsal fin nearer to base of caudal 

 fin than to eye ; origin of anal fin under last dorsal rays ; pectoral fin with 

 no large blackish or dark area. 

 3a. Scales between lateral line and base of ventral fin 4 or 5 ; predorsal scales 



42 to 59 riveroi 



36. Scales between lateral line and base of ventral fin 5 to 7 ; predorsal scales 



27 to 30 typus 



Ic. Scales in lateral line 75; scales in transverse series between midline of back 

 and lateral line 14; predorsal scales 45; gill rakers on lower arm of first 

 arch 30; branched anal rays 20 harmandi 



PARALAUBUCA BARRONI (Fowler) 



Chela barroni Fowleb, 1934a, p. 109, fig. 61 (Mekong at Chiengsen). 

 Culter harroni Fowlee, 1937, p. 164 (Pitsanulok, Kemarat). 



The type specimen was 10.4 cm. long. Later numerous specimens 

 5.6 to 15 cm. long were obtamed from Pitsanulok, on the Nan in Central 

 Thailand, and from Kemarat, on the Mekong in Eastern Thailand. 



Of all the local species of this genus, P. harroni has the largest and 

 fewest scales and fewest gill rakers. Fowler gives 46 scales in the lat- 

 eral line, 8 between the lateral line and the origin of the dorsal, and 

 38 in the predorsal region ; and 18 gill rakers on the lower arm of the 

 first arch. 



PARALAUBUCA STIGMABRACHIUM (Fowler) 



Chela stigmabrachium Fowler, 1934a, p. 109, fig. 62 (Mekong at Chiengsen). 

 Culter stigmabrachium Fowlee, 1937, p. 166 (Bangkok, Mepoon, Tachin, Kemarat) . 



Inhabiting the basins of both the Mekong and the JSIenam Chao 

 Phya, this species is now represented by numerous specimens in 

 collections. A length of 16 cm. is attained. 



