The Fresh Water F'ishes of the Island of Formosa. 277 



caudal peduncle very short, its depth less than twice in the length of 

 head. 



Scales large, ctenoid; lateral line indistinct, \'isible only on the 

 anterior nine scales. 



Color greenish gray, with ten brown cross-bars on the sides, one of 

 which is on the nape; a dark brown, round spot on the extremity of 

 gill-cover, a somewhat paler short streak between the orbit and that 

 spot; caudal fin with two brown cross-bars near the base; dorsal and 

 caudal fins speckled with brown; base of the anal brownish; pectoral 

 and ventral fins whitish. 



Length of body 58 mm. 



Described from a specimen from Taihoku, collected by Oshima in 

 February, 1917. 



Habitat: Abundant in the ditches and stagnant pools throughout 

 the Island. My specimens came from Taihoku; Wodensho, Taichu. 



Measurements of Poly acanthus operculalus. 



Locality. 



w 





Taihoku 

 Taihoku 

 Taihoku 

 Taihoku 

 Taihoku 



3.66 28-12 

 3.33J28-12 

 3.50128-12 

 3 28-12 

 3.66'28-i2 



Genus Macropodus Lacepede. 



1802. Macropodus Lacepede, Hist. Nat. Poiss., Ill, p. 416. (Type Macropodus 



viridiaiiralus Lacepede). 

 1861. Macropus GiJnther, Cat. Fish., Ill, p. 381. (Type Macropodus viridiaur- 



atus Lacepede.) 



Body compressed, oblong; operculum without spine or serrature; 

 cleft of mouth rather small, not extending beyond a vertical from the 

 orbit. Small fixed teeth in the jaws, none on the palate. Dorsal 

 and anal spines numerous (thirteen to eighteen) ; ventral fins composed 

 of one spine and five rays, which are w^ell-developed; soft dorsal, anal 

 and caudal with long filamentous rays. Caudal fin forked or ending 

 in a bundle of long filaments. Lateral line absent. Branchial arches 

 with toothed tubercles. Pyloric appendages in small number; 

 intestine of moderate length. 



Distribution: Fresh waters of China, Cochin-China, and Botel 

 Tobago. 



