8 Rhichardsonius, 
V. Richardsonius hakuensis (Giinther). (Cyprinidz.) 
Plate II, fig. 8, g and 1o. 
Ugui; Akauwo (red fish); Akahara (red belly) ; Ida. 
Leuciscus hakuensis Giinther, Challenger, Shore fishes, 1880, p. 72, pl. XXXI, fig. B 
Lake Hakone—Jordan and Fowler, Proc. U.S. Nat. Mus., XXVI, 1993, p 
846; adult female from Like Jusan in Aomori. 
Habitat—Brackish water and lower parts of rivers; southern Sikhalin through 
Hokkaido and Hondo to Shikoku and Kiusiu; Gensan, Korea. 
Head 4, height of body 5 in total length without caudal. Eye 5, interorbital 22, 
snout 3 inhead. D.III,7; A. IlI,8; P.18; V.9. Scales 144—75—14}. 
Body elongate, compressed. Head compressed, pointed. Interorbital space and 
top of head convex. Mouth moderate, subinferior, the maxillary protractile, not extend- 
ing to vertical through anterior rim of eye. Pharyngeal teeth 5,2—2,4. Gill-rakers 
on first gill-arch rather short, pointed, 3+ 9; pseudobranchize developed. Darsal 
inserted midway between tip of snout and base of caudal ; anal inserted behind base of 

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