FRESH-WATER FISHES OF SIAM, OR THAILAND 419 



AKYSIS ARMATUS Vaillant 



Akysis armatus Yaitxant, 1902, p. 64 (Mahakam, Borneo). — Smith, 1931d, p. 180 

 (Patani). 



A specimen, 4 cm. long, from the Talebun district of Patani, Penin- 

 sular Thailand, is identified as this species, otherwise known only from 

 Borneo. 



AKYSIS LEUCOEHYNCHUS Fowler 



Akysis leucorhynchus Fowlee, 1934a, p. 97, figs. 44, 45 (Chiengmai). 



Ten specimens, 2.2 to 3.3 cm. long, were reported by Fowler from 

 the Meping at Chiengmai, Northern Thailand. In April 1935 Deignan 

 collected eight specimens at the same place, the largest 3 cm., the 

 smallest 2 cm. long. All these have the space between the sharply 

 defined white snout and the first black cross band a rich dark brown. 

 A specimen 3 cm. long is a female with large ovaries containing nearly 

 ripe eggs. 



AKYSIS MACRONEMUS Bleeker 



Akysis macronema Bleekee, 1860 (271), p. 11 (Lahat, Sumatra). — Smith, 1931d, 

 p. 180 (Chantabun River). 



The validity of this species, described from Sumatra in 1860 and 

 apparently not again detected for 70 years, and the identification 

 therewith of eight specimens taken in the Chantabun River in South- 

 eastern Thailand in February 1927, are discussed in the writer's paper 

 cited above (Smith, 1931d). 



The colloquial name for this tiny fish (largest 3.4 cm.) at Chanta- 

 bun is pla kayuy. 



Order Cyprinodontes : Toothed minnows 



This order, which reaches a very large development in the Western 

 Hemisphere, is comparatively sparsely represented in the Old World. 

 In Thailand there are only two known indigenous species and one in- 

 troduced species, which fall into two families, as follows : 



la. Oviparous ; anal fin in male not modified into an intromittent organ. 



Cyprinodontidae 

 1&. Viviparous ; anal fin in male modified into an intromittent organ — Poeciliidae 



Family CYPRINODONTIDAE: Killifishes 



The local species of this world-wide family belong in two well- 

 marked genera to which various names have been applied. The nomen- 

 clatorial questions involved have been indicated in a paper by the 

 writer (Smith, 1938b), and the conclusions therein reached are em- 

 bodied in the present treatment. 



