The Fresh Water Fishes of the Island of Formosa. 195 



reaching the ventral, one outer ray undivided; ventral inserted 

 beneath the middle of base of dorsal, ovoid, middle ray the longest; 

 anal fin large, when depressed scarcely reaching the root of caudal; 

 caudal fin elongate, weakly emarginate, each lobe sharply pointed. 



Bod}' covered with minute scales, head and lower surface naked; 

 lateral line nearly straight, extending along the middle of the sides. 



Color in formalin dark yellow, mottled with irregular dark brown 

 blotches, lower surface white; head uniformly dark, with few yellowish 

 markings; fin-rays of the dorsal with elongate black spots; caudal fin 

 with a number of black cross-bars; other fins dusky, with numerous 

 dark spots. 



Total length 117 mm. 



The present description is from a specimen from Tamusui River 

 near Shinten, collected by T. Aoki in December, 1916. 



Habitat: Tamusui River (four specimens). 



Remarks: The present species is very closely related to Boulenger's 

 Homaloptera stenosoma (misprinted Homalosoma) from Ningpo, 

 China (Proc. Zool. Soc. London, March, 1901, p. 270), which seems to 

 belong to the genus Formosania. The latter differs from F. gilberti 

 in having seven-branched dorsal rays, a smaller number of scales in 

 the lateral line, and slightly shorter head and pectorals. 



Genus Hemimyzon Regan. 



191 1. Hemimyzon Regan. Ann. Mag. Nat. Hist. (8), p. 31. (Type Homaloptera 

 formosaniis Boulenger.) 



Body much depressed, nearly twice as broad as high; head disc- 

 shaped, flattened; snout broad, with sharp anterior margin; mouth 

 inferior, transverse, with fringed upper lip; edge of the lower jaw 

 sharp, horny; six barbels, inferior, two pairs on the extremity of the 

 snout, the others at the angle of mouth, minute and subequal; origin 

 of ventral in advance of that of dorsal; the pectoral subhorizontal, 

 eleven outer rays simple; ventral fin horizontal, four outer rays simple; 



