FRESH-WATER FISHES OF SIAM, OR THAILAND 519 



ticulars that Giinther (1861, vol. 3) and Day (1870-78) made no men- 

 tion of the species. It remained for Mukerji (1936) to point out that 

 GohieUa pellucida from Thailand, as well as Gobiella birtwistlei Herre 

 (1934) from Singapore, is specifically the same as Gohiopterus chuno. 

 Mukerji gave figures of the jaws and teeth and of the tongue based on 

 specimens from Bangkok. These figures show a single row of wide- 

 spaced conical teeth in each jaw, with a pair of postsymphyseal canines 

 in the lower jaw, and a bilobed tongue. 



There appears to be a numerical disproportion of the sexes, the 

 females being more numerous in every lot collected, in the ratio of 2 or 

 4 to 1. Fully mature fish of both sexes range from 18 to 21 mm, in total 

 length, with no difference in the average size of males and females. 

 The transparent abdominal walls permit a clear view of the eggs. 



GOBIOPTERUS BRACHYPTERUS (Blecker) 



Apocryptes Irachypterus Bleekeb, 1855 (138), p. 401 (Java). 

 Micrapocryptes sp. Hoba, 1924a, p. 495, fig. 7 (Tale Sap). 



This species was first described as Apocryptes hrachypt&rus by 

 Bleeker and later made the type of his genus Gobiopterus. Hora 

 (1924a) reporting on fishes collected in the Tale Sap by Dr. Annandale, 

 found two specimens, 16.5 and 18 mm. long, which were referred to 

 Hora's new Indian genus Micrapocryptes^ which Hora later synony- 

 mized with Gohiopterus. The specimens could not be identified sat- 

 isfactorily as to species but were thought by Hora to be closest to 

 Gohiopterus hrachypterus from Java. On the basis of the foregoing 

 information, the assignment of this species to Thailand, while entirely 

 plausible, must be regarded as tentative. 



Genus PIPIDONIA H. M. Smith 



Pipidonia H. M. Smith, Proc. U. S. Nat. Mus., vol. 79, art. 7, p. 39, 1931. (Type, 

 Pipidonia quinquecincta H. M. Smith. ) 



PIPIDONIA QUINQUECINCTA H. M. Smith 

 Pipidonia quinquecincta Smith, 1931a, p. 39, fig. 19 (Koh Pipidon). 



This rare goby is known from a specimen, 2.6 cm. long, taken in a 

 tide pool on the island of Pipidon lying a short distance off the west 

 coast of Peninsular Thailand south of Puket. The type, assigned 

 U.S.N.M. No. 90317, appears not to have been received ; hence it is not 

 possible to verify and amplify certain details of the original descrip- 

 tion. Especially desirable is the verification of the presence of five 

 spines in the first dorsal fin, as represented in the dravv'ing of a Thai 

 artist and as independently determined by the writer. 



Attention should be drawn to the goby called Hetereleotris arenarius: 

 by Snyder (1908, p. 100; 1912, p. 513, pi. 67, fig. 3), based on a few 



