FRESH-WATER FISHES OF SIAM, OR THAILAND 563 



APOCRYPTODON MALCOLMI H. M. Smith 



Apocryptodon malcolnd Smith, 1931a, p. 47, fig. 22 (Chantabun River) — 



FoWLEB. 1937, p. 257 (Bangkok, Tachin). 

 BoleopMhalmus smithi Fowlee, 1934a, p. 160, fig. 129 (Bangkok) ; 1935a, p. 162 



(Bangkok, Paknam). 



Originally known from the Chantabun River and later found in 

 brackish water in the Chantabun Estuary, this species was more re- 

 cently reported by Fowler from numerous specimens from the Menam 

 Chao Phya at Bano^kok and Paknam and several from the Tachin. 

 The type, 7.5 cm. long, is a fully developed female. 



A length exceeding 20 cm. is attained by Bangkok specimens. 



APOCRYPTODON EDWARDI Fowler 



BoleopMhalmus taylori Fowleb, 1984a, p. 159, fig. 128 ; Bangkok ; 1935a p 162 

 (Bangkok, Paknam). 



Apocryptodon edivardi Fowler, 1937, p. 257 (Tachin, Bangkok). (Correction of 

 generic identification and substitution of new specific name for taylori pre- 

 occupied.) ' 



Described from the Menam Chao Phya at Bangkok and later re-' 

 corded from Paknam and Tachin, this species is noteworthy for hav- 

 ing extremely small scales on head and body (165 in longitudinal series 

 and 35 in transverse series, with 60 in the median line anterior to the 

 dorsal fin) , a single row of widely spaced blunt teeth in each jaw with 

 a pair behind the mandibular symphysis, a free lower eyelid, and a 

 very striking pattern of coloration of the caudal fin : 16 or 17 narrow, 

 distinct, wavy, curved dark cross bands. The five specimens recorded 

 by Fowler ranged from 17 to 23.2 cm. in total length. 



Even with information supplied in a letter by Mr. Fowler additional 

 to that contained in the published descriptions, it is not possible to 

 make a wholly satisfactory generic ollocation of this species chiefly 

 because of the teeth, which in the upper jaw are norinally conical with 

 the anterior ones caniniform and in the lower jaw are flattened, sub- 

 horizontal, and obliquely truncate, notched, or bilobed. 



Genus APOCRYPTICHTHYS Day 



Apoaryptichthys Day, Fishes of India, vol. 1, p. 302, 1876. (Type, Apocryptichthys 

 cantoris Day.) 



The fishes of this genus are few as to species and of small size, 

 apparently not reaching a length of 10 cm. The type species, A. 

 cantons (Day, 1870b, p. 693) remained unique until 1927, when Herre 

 described a new species from China, and in 1935 Fowler named a new 

 species from Thailand. The two forms reported from Thailand A. 

 cantoris and A. livingstoni, may prove to be identical. The former 

 has been found in the Gulf of Siam ofl' the mouth of the Meklong, the 



