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, 5.1 cm. long, with well-developed 

 ovaries, which showed no black spot above the base of the anal fin, 

 while a male, 5.8 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 7.3 cm. with nearly ripe eggs, and from a lagoon 

 at Chiengmai in August 1935, of which the largest, 4, 4.5, and 5.4 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, 4.1 to 6 cm. long, were taken December 25, 1936, at a point 

 w^here the stream was a torrent at the base of mountains. 



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 

 3.4 to 8.7 cm. A lot of 19 specimens from Kao Sabap ranged from 

 3.4 to 11.5; the largest group, taken in April, averaged 8.7 cm. (range 

 7.2 to 11.5), the smallest group, taken in July, averaged 4.9 cm. (range 

 3.4 to 5.9). 



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 by the writer on the curious group of lime- 

 stone islands in the Tale Sap known as Koh Si Koh Ha, October 7, 



