532 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 



The type, 6 cm. long, taken in December, was a female with well- 

 developed ovaries. 



ACENTROGOBIUS MASONI (Day) 



Oobius masoni Day, 1873, p. 107 (Bombay). 



Ctenogohius masoni Fowleb, 1937, p. 252, fig. 281 (Paknam, Tachin). 



Described from Bombay in 1873 under the name Gohius 'imisoni, 

 this species was identified by Fowler (1937) as being represented by 

 three specimens, 4.9 to 6.7 cm. long, from the lower Menam Chao Phya 

 and Tachin Rivers. The fully scaled predorsal region, with the scales 

 extending to the eyes, and the presence of scales on the opercles do 

 not conform with the accepted definition of Ctenogohius {Rhino- 

 gohius), and apparently require the allocation of this species in Acen- 

 trogohius. 



ACENTROGOBIUS CANINUS (Cuvier and Valenciennes) 



OoMus caninus Cuvies and Valenciennes, 1837, vol. 12, p. 86 (Java). 

 Rhinogobius caninus Fowler, 1935a, p. 161 (Bangkok, Paknam). 

 CtenogoMus caninus Fowler, 1937, p. 252 (Tachiu). 



From the southern coast of China and the Philippines this species 

 ranges to India. It appears to be represented in all parts of the Gulf 

 of Siam and in the lower courses of rivers debouching therein, and 

 material has been extended from Patani, Singora, and Pak Payoon 

 in Peninsular Thailand, Tachin, Chao Phya, and Bangpakong Rivers 

 in the Central area, and Chantabun Estuary in Southeastern Thailand. 



A size commonly attained in Thailand is 9 to 10 cm. The largest 

 local example examined was 12.5 cm., from the Gulf of Siam off Nakon 

 Sritamarat. 



The specific name canirius refers to the presence of one or two con- 

 spicuous canine teeth on each side of the lower jaw at the posterior 

 end of the outer row of teeth. This feature, however, is not peculiar 

 to this species but prevails throughout the genus. 



Vernacular names given to this fish in parts of Thailand are pla hu 

 khao (white goby) and fla hu tale (sea goby). 



ACENTROGOBIUS VIRIDIPUNCTATUS (Cuvier and Valenciennes) 



Oobius viridipunctatus Cuvier and Valenciennes, 1837, vol. 12, p. 62 (Bombay). 

 CtenogoMus viridipunctatus Fowlee, 1937, p. 252, flg. 280 (Tachin). 



From the west coast of India to Thailand and Malaya, this species 

 ranges through the East Indies to the Philippines. It may be recog- 

 nized by the features indicated in the key. In Thailand it is known 

 from river mouths and estuaries around the Gulf of Siam, although 

 there appears to be only one published record, for the Tachin River. 



A length of 12 cm. is attained. 



