. Bulletin - United States National Museum. Science. FRESH-WATER FISHES OF SIAM, OR THAILAND 115 From various upper tributaries of the Nan River, Deignan collected specimens in April and June 1936, all of them approaching the spawning condition. Specimens from Huey Lom, an affluent of the Nan, June 1 to 3, included a female, cm. long, with well-developed ovaries, which showed no black spot above the base of the anal fin, while a male, cm. long, had the characteristic black spot over the anal. Other specimens obtained by Deignan were from the Meta, a branch of the Meping in the Khun Tan
. Bulletin - United States National Museum. Science. FRESH-WATER FISHES OF SIAM, OR THAILAND 115 From various upper tributaries of the Nan River, Deignan collected specimens in April and June 1936, all of them approaching the spawning condition. Specimens from Huey Lom, an affluent of the Nan, June 1 to 3, included a female, cm. long, with well-developed ovaries, which showed no black spot above the base of the anal fin, while a male, cm. long, had the characteristic black spot over the anal. Other specimens obtained by Deignan were from the Meta, a branch of the Meping in the Khun Tan Mountains, in February 1936, the largest a female of cm. with nearly ripe eggs, and from a lagoon at Chiengmai in August 1935, of which the largest, 4, , and cm. long, were females with eggs nearly ready for deposition. Another locality represented in the Deignan collection is the Menam Mao, a branch of the Menam Fang, tributary of the Mekong; 3 specimens, to 6 cm. long, were taken December 25, 1936, at a point w^here the stream was a torrent at the base of Figure 13.—Rasbora lateristriata Lateristriata (Bleeker). Drawn byl Luang Masya; courtesy of the Thailand Government. The maximum length of this species, as given by Weber and de Beaufort, is 12 cm. Fish of this size are quite unusual in Thailand. A batch of IT specimens taken on Koh Chang in April measured from to cm. A lot of 19 specimens from Kao Sabap ranged from to ; the largest group, taken in April, averaged cm. (range to ), the smallest group, taken in July, averaged cm. (range to ). Although reported as taken in abundance at Bangkok and other lowland places, this species in Thailand is characteristically a fish of cool, clear, swift water such as is met with in mountain streams, and it is well represented on large islands on which it is usually the only species of the genus. The first specimens noted in local waters ap- pear to have been collected
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