580 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
red on sides or under throat; the lower fins yellowish in spawning- 
female. Abundant in the Kitakami at this season, also sent in from 
Aomori, It has no teeth on the shaft of the vomer, or almost none, 
as in Sal mo salar. Its flesh is firm and red, as in the Atlantic salmon, 
and the flavor, is the same. 
One small spawning female taken at Morioka. Spent males seen in 
Hakodate; two taken are blackish, very thin, with a red bar on side 
interrupted by black bars. 
(Named for Commodore Perry.) 
S. HUCHO Glinther. 
Hucho GtJNTHER, Cat. Fish., VI, 1866, p. 125 {Imcho). 
Body slender, elongate, the head pike-like, with vertical sides, and 
flattened snout and frontal region; mouth large; vomer as in Sal/velhius, 
the shaft depressed below the head and without teeth; palatine teeth 
strong; strong teeth on the tongue, none on the hyoid region; scales 
silvery, large or small, the body marked with small black dots; anal 
fin short; branchiostegals 12; gill rakers few. 
Old World fishes, large pike-like trout, intermediate between the 
charrs and the salmon. 
{hucho, an old name of Hucho hucho, from the German Huch or 
Huchen.) 
6. HUCHO BLACKISTONI (Hilgendorf). 
ITO-UWO (STRING-FISH. ) 
Salmo hlacl-istoni Hilgendorf, Monatsber, Gesellschaft Ostasien, 1876, p. 25; 
Hokkaido.— IsHiKAWA, Prel. Cat., 1897, p. 21; Hokkaido. 
Head 3i in length; depth 5; depth of caudal peduncle 3i in head; 
eye 5; interorbital space -li; snout 4; maxillary 2|^; D. 10; A. 9; scales 
in lateral series 109, in transverse series 18 + 17; pores in lateral line 
Fig. 3.— Hucho blackistoni. 
97. Head long, low, broad, pike-like, quadrangular in section; inter- 
orbital area broad, slightly convex; maxillary extending a little beyond 
eye. Teeth small, those on lower jaw longest; no teeth on shaft of 
vomer, even in the young; tongue with a row of sharp teeth on each 
