200 BULLETIN 188, UNITED STATES NATIONAL MUSlSUM 



Squamation : Scales in lateral line 2G, in transverse series to base 

 of ventral fin 5.5-1-2.5, in predorsal region 8, around caudal peduncle 

 14 ; a scaly sheath at base of dorsal and anal fins. 



Fins: Dorsal fin arising directly over base of ventrals, nearer to 

 tip of snout than to base of caudal, over eighth scale of lateral line; 

 dorsal rays iii,8, the last simple ray stout and strongly denticulated 

 on its posterior side; caudal deeply forked, its lobes pointed, and 

 longer than head; anal rays iii,5, the longest branched ray 1.3 in 

 head ; ventrals extending to anal opening, rays i,8 ; pectorals equal to 

 and reaching base of ventrals, shorter than head, the rays i,16; ventral 

 axillary scale less than 0.5 length of fin. 



Coloration : Silvery ; each scale of back and sides with a dull green 

 basal crescent ; fins plain. 



Type.— ThQ type (U.S.N.M. No. 117748), 13.3 cm. long, apparently 

 a female, was collected in the Meping at Raheng, Central Thailand, 

 in July 1924, by Dr. Malcolm Smith. 



Reinai'hs. — The comparatively deep body, rather large scales, posi- 

 tion of the dorsal fin with reference to the ventrals, dorsal fin with 8 

 branched rays and a denticulated simple ray, together with the colora- 

 tion, serve to differentiate this species. The nearest relative among 

 the local members of the genus is A. vittatus^ which has a slenderer 

 form, two less rows of scales above the lateral line, 12 instead of 14 

 circumpeduncular scales, origin of dorsal fin in advance of, instead 

 of directly over, ventrals, and different coloration. 



This species is named for Dr. Malcolm Smith, formerly of Thailand, 

 now of the British Museum, in appreciation of his efforts to promote 

 knowledge of Thai zoology, especially of the fishes and reptiles. 



ACROSSOCHEILUS DEAURATUS (Cuvier and Valenciennes) 



Barbus deauratus Cuvieb and Valenciennes, 1842, vol. 16, p. 188 (Cochiiichina). — 



Saxjvage, 1881, p. 183, pi. 6. fig. 5 (Cochinchina). 

 Barbus (Lissochilus) deauratus Hoea, 1923b, p. 155 (Koh Chang). 

 Poropuntius normani Smith, 1981a, p. 14 (Kao Sabap). 



This fish has been found to be distributed widely in Thailand and 

 common in various parts of the country. On Koh Chang, the large, 

 mountainous, wooded island in the Gulf of Siam off Southeastern 

 Thailand, this is tlie commonest fish in the upper parts of the several 

 streams. Its favorite haunts are the clear, deep, rocky pools below 

 waterfalls. Numerous specimens were collected during half a dozen 

 years. Other localities from which specimens have come are streams 

 on Kao Bantad, Province of Krat, Southeastern district; headwaters 

 of the Menam Sak, Central area; and Huey Mekong Kha, a tributary 

 of the Sal win west of Mesarieng, Western Thailand. In the Menam 



