FRESH-WATER FISHES OF SlAM, OR THAILAND 213 



Throughout its range in Thailand the fish bears the vernacular 

 name of fl^a p^rom or pla prom hua men, the last two words meaning 

 smelly head. 



OSTEOCHILUS WAANDERSII (Bleeker) 



Rohita waandersU BLEEKtai, 1852 (70), p. 733 (Toboali Province, Banka.) 

 Osteochilus waandersi Boui^nger, 1903, p. 303 (Patani River). 



The only Thailand record for this fish of Sumatra and Bangka is 

 that of Boulenger, who found the species represented by a half- 

 grown specimen in a collection made by Annandale and Robinson in 

 the Patani River, between Biserat and the town of Patani. The 

 differential characters are absence of pores or tubercles on the snout, 

 6.5 or 7 series of scales between the midline of the back and the lateral 

 line, 7 series of scales below the lateral line, 12 branched rays in the 

 dorsal fin, and a black band from the head to the tips of the median 

 caudal rays. There is a strong resemblance to O. vittatus, in which 

 there is always a large median rostral pore or horny tubercle with a 

 smaller one on either side, the three being in a straight liorizontal row. 



A length of about 20 cm. is attained. 



OSTEOCHILUS SCAPULARIS Fowler 



OsteocJiilus scapularis Fowleb, 1939, p. 69, figs. 17, 18 (Trang). 



Known from a single specimen, 13.8 cm. long, from a waterfall 

 stream near Trang in Peninsular Thailand, this species has a combi- 

 nation of features by which it may be distinguished from related 

 forms: Rather deep body (depth 2.8), large head (3.5 in standard 

 length) , two pairs of barbels, 31 scales in the lateral line, 6-1-5 scales 

 in transverse series to base of ventral fin, 10 predorsal scales, 14 circum- 

 peduncular scales, 44 short gill rakers, 12 branched rays in the dorsal 

 fin, a blackish longitudinal band most distinct on the posterior half 

 of the body and extending on the base of the central caudal rays, a 

 black bar on the body along the upper edge of the gill opening, each 

 scale of the back and sides with a black basal spot, and all fins reddish. 

 The lips are described as "broad, thin, edged all around with row of 

 papillae, inner surfaces strongly striate, outer less so, medial and 

 symphyseal region well papillated or fringed," and the coriaceous 

 mandible has "5 cutaneous folds each side." The description makes 

 no mention of rostral pores, but the figure indicates 3 large pores at 

 the front of the snout. 



The species is rather close to 0. vittatus, with which it agrees in 

 squamation, rostral pores, fin rays, and falcate vertical fins. Differ- 

 ences are in body proportions, in fewer circumpeduncular scales, in 

 origin of the anal fin under the last rays of the dorsal fin (anal aris- 



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