216 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



scription and figures of this sjiecies and does not fit into the account 

 of any other species. 



OSTEOCHILUS VITTATUS (Cuvier and Valenciennes) 



Plate 6 



Rohita vittata Cuvieb and Valenciennes, 1842, vol. 16, p. 267 (Java). 

 Osteochilus vittatus Fowler, 1934a, p. 116, figs. 68-73 (Chiengsen, Chiengmai) ; 



1935b, p. 510 (Old Chiengsen) ; 1937, p. ISO, figs. 122, 123 (Bangkok, Kem- 



arat) ; 1939, pp. 39, 69 (Khao Bhanam Bencha, Trang). 



This species abounds in rivers and lakes in Java, Borneo, Sumatra, 

 and the Malay States, and in Thailand it is one of the commonest 

 and most widely distributed members of the genus Osteochilus. It 

 has been found in all parts of the countrj'^ except the western drainage, 

 and it is particularly numerous in the basin of the Menam Chao Phya, 

 which river it regularly descends as far as Paknam. 



A length in excess of 20 cm. is normally attained. The largest local 

 specimen actually measured was 23.5 cm long, from the Pran River 

 May 29, 1928; this was a female, with ripe eggs. Full maturity, how- 

 ever, is attained at a much smaller size. Thus, a number of fishes 

 under 6 cm. long taken in Borapet Swamp in November 1923 were 

 females with large ovaries. 



This is a strikingly marked species. The adults have a broad black 

 band from the eye to the caudal fin, and usually the black band extends 

 to the posterior end of the middle caudal rays. In some examples 

 the back may be dark purplish or purplish black, and the lateral band 

 then stands out less prominently. 



Among the vernacular names borne by this fish is pla rong mai tab 

 in common use in the Nakon Sritamarat province. In Southeastern 

 Thailand the fish is called jyla hang lai. 



to 'iOJj 



OSTEOCHILUS LINI Fowler 



Osteochilus lini Fowler, 1935a, p. 118, figs. 54, 55 (Khao Nam Poo). 



The principal features of this species, 6.5 to 8.4 cm. long, known 

 from numerous specimens from Khao Nam Poo in northern Central 

 Thailand are the fringed lips, 2 pairs of barbels, 2 or 3 irregular rows 

 of pores on the front of the snout, 33 or 34 scales in the lateral line, 

 and a black blotch on both sides of the lateral line above the pectoral 

 fin. 



OSTEOCHILUS SCHLEGELI (Bleeker) 



FiGxniE 38 



Rohita schlegeli Bleeker, 1851 (49), p. 432 (Bandjermassing, Borneo). 

 Rohita (Rohita) schlegeli Bleeker, 1865 (356), p. 174 (Siam). 

 Osteochilus schlegelU Sauvage, 1881, p. 163 (Siam) ; lS83b, p. 152 (Menam Chao 

 Phya). — Weber and de Beaufort, 1916, vol. 3, p. 129 (Siam). 



The range of this fish includes Borneo and Sumatra as well as 

 Thailand. In the Thai rivers the fish is neither widely distributed 



