FRESH- WATER FISHES OF SIAM, OR THAILAND 483 



key. Its closest relative seems to be G. ranga^ of India, Burma, and 

 Thailand, which has smaller scales and a deeper body. A ventral axil- 

 lary scale, described as going 2.8 times in the length of the ventral fin, 

 is not represented in the drawing which accompanies the account of 

 this species. Three specimens 3 to 3.9 cm. long obtained by H. G. 

 Deignan in January 1937 from the Mekong at Chiengsenkao, Northern 

 Thailand, may be referable to this species, although they are slightly 

 more elongate; lateral line tubules 53, dorsal VIII, 13, anal III, 13 

 and III, 14. 



CHANDA RANGA Hamilton 



Chanda ranga Hamilton, 1822, pp. 113, 371, pi. 16, fig. 38 (Gangetic provinces). 



This Indian species has once been taken in Thailand waters and may 

 be looked for throughout the Salwin drainage in the Northern and 

 Western districts. Two specimens 6.7 and 7.7 cm. long were obtained 

 in a small affluent of the Pai Kiver at Mehongsorn, Northern Thailand, 

 in June 1932. 



According to Day (1876, vol. 1), Hamilton's Chanda Ma is the 

 young of this species. Bleeker in 1874 (457) made lala the genotype 

 of his new genus Pseudamhassis^ which would thus seem to become 

 void. 



The local vernacular name for the fish is pla peer. 



CHANDA BACULIS Hamilton 



Chanda lacuHs Hamilton, 1822, p. 112 (Ganges). 



There has been no previous Thailand record for this species of fresh 

 waters of Burma and India. It has been found to be common in Cen- 

 tral Thailand in the Sikuk River, in the headwaters of the Menam 

 Chao Phya at Paknampo, in the lower Menam Nan, and in Bung 

 Borapet and several of its outlets. The fish is recognizable in the 

 field by the intensely black edge on the spinous dorsal fin and the 

 glistening golden spot on the occiput. 



This is one of the smallest species of Chanda. The maximum length 

 of local specimens has been 4.5 cm. 



The vernacular name pla kamao is given to this fish as well as to other 

 species of the genus. 



CHANDA GYMNOCEPHALA (Lacepede) 



Lutjavus gymnocephalvs Lacepede, 1802, vol. 3, pi. 23, fig. 3; vol. 4, p. 216 (Su- 

 matra). 

 Amhassis gymnoccpJiahts Fowlek, 1937, p. 232 (Bangkok, Paknam, Tachin). 



The range of this little species extends from East Africa and Aus- 

 tralia to India, Malaya, East Indies, Philippines, and China. It was 

 first detected in Thailand in October 1923, when three specimens were 



