FRESH-WATER FISHES OF SIAM, OR THAILAND 569 



The Thailand species are differentiated by the following characters : 



la. Dorsal and anal fins more or less completely united with caudal. 

 2a. A pair of postsymphyseal canine teeth in lower jaw, about 16 large curved 

 teeth in outer row of upper jaw, about 14 in lower jaw ; scaleless ; general 



color pink ang'uillaris 



26. No postsymphyseal canine teeth in lower jaw. 

 3a. Scaleless ; depth of body 18.5 to 20 times in total length ; about 10 large 

 curved teeth in outer row of each jaw; general color olivaceous, fins 



darker ^ gracilis 



3&. Posterior third of body covered with minute cycloid scales; depth of 

 body about 14 times in total length ; about 6 large curved teeth in outer 

 row of upper jaw, about 8 in lower jaw ; general color olivaceous, ver- 

 tical fins black nigrimarginatus 



16. Dorsal and anal fins completely separated from caudal ; no postsymphyseal 

 canines in lower jaw; 8 to 10 large curved teeth in outer row of upper 

 jaw, 6 to 8 in lower jaw ; scaleless ; general color bright pink or pale yellow, 

 with a series of round brownish spots along side cirratus 



TAENIOIDES ANGUILLARIS (Linnaeus) 



OoMus anguillaris Linnaeus, 1766, p. 450 (China). 



Taenioides anguillaris Fowlek, 1935a, p. 163 (Bangkok, Paknam). 



Taenioides angullaris Fowt^b, 1937, p. 257 (Bangkok). 



An eellike goby recorded from India, the Indo-Australian Archi- 

 pelago, China, and elsewhere under the name Taenioides anguillaris 

 may not with certainty be identified with Gohius anguillaris Lin- 

 naeus, the description of which is very brief and applicable to several 

 Oriental species now referred to the genus Taenioides. The species 

 herein considered is the one described and figured by Day (1876-78) 

 as GoHoides anguillaris (Linnaeus) and characterized by features 

 shown in the preceding key. 



The species was first met with in Thailand in 1927, when the writer 

 obtained several specimens from a pongpang net in the Menam Chao 

 Phya near Bang Torani, between Bangkok and Ayuthia ; the largest 

 of these was 9.5 cm. long. Fowler (1935a and 1937) referred to 

 seven specimens, 10.8 to 23.6 cm. long, taken in the Menam Chao Phya 

 at Bangkok and Paknam. 



TAENIOIDES GRACILIS (Cuvier and Valenciennes) 

 Amblyopus gracilis Cxjvieb and Valenciennes, 1837, vol. 12, p. 166 (Pondicherry). 



This goby ranges from India to the East Indies and the Philip- 

 pines. It is apparently rare in Thailand, and only a single definite 

 record is available, a fish, 13.5 cm. long, taken in the Menam Chao 

 Phya at Paknam in June 1927. 



A length of 19 to 20 cm. is reported in other waters. 



