574 BULLETIN 188, UNITED STATES NATIONAL MUSEUM 

 CHONERHINUS MODESTUS (Bleeker) 



Tetraodon (Arothroii) modestus Bleeker, 1851 (26), p. 16 (Bandjermassing, 



Borneo). 

 Chonerhimcs modestus Hora, 1923&, p. 183 (Nontaburi). 



In the lower part of the Menam Chao Phya basin this fish of the 

 rivers of Borneo, Sumatra, and Malaya is fairly common in some places 

 and at certain times. Seven specimens collected at Bangkok, on De- 

 cember 17, 1925, were in spawning condition, the largest, a female 13 

 cm. long, having ripe eggs. 



In life this species is of a beautiful golden yellow or golden greenish 

 color. 



The vernacular name pla pak pao, which is borne by the tetraodonts 

 generally, in the case of this fish is modified into pla pak pao tong 

 {tong, golden). 



CHONERHINUS NARITUS (Richardson) 



Tetraodon naritus Richardson, 1848, p. 18, pi. 8, figs. 1-3 (Sarawak River, 



Borneo). 

 Chonerhinus naritus BleeIkee, 1865 (347), p. 33 (Siam) ; 1865 (356), p. 172 



(Siam). 



The only Thailand records for this species are those of Bleeker, 

 based on a specimen or specimens in the Musee du Jardin des Plantes 

 a Paris collected by Bocourt in 1861-62, probably in the Menam Chao 

 Phya at Bangkok or Ayuthia. The fish inhabits the rivers of Sumatra 

 and Borneo, and Bleeker notes the length of specimens therefrom as 

 ranging from 6.4 to 28.5 cm. 



Genus CHELONODON Muller 



Chelonodon Muxler, Abh. Preuss. Akad. Wiss. Berlin, 1839, p. 252. (Type, 

 Tetrodon patoca Hamilton.) 



In this genus the body is cylindrical, the head very broad, the back 

 and abdomen are covered with small spines leaving a smooth area along 

 the side; the single shallow, imperforate nostril on each side is sur- 

 rounded by a short tube margined with flaps or a fringe ; dorsal and 

 anal fins are short, with 6 to 9 branched rays. 



CHELONODON PATOCA (Hamilton) 



Tetrodon patoca Hamilton, 1822, pp. 7, 362 (Ganges), 



f Chelonodon dumerili Bleeker, 1865 (347), p. 33 (Siam); 1865 (356), p. 172 

 (Siam). 



This is a well-known species ranging from India to China, Malaya, 

 and various islands of the East Indies, frequenting coastal waters and 



