Vol. 38, pp. 49-56 March 12, 1925 PROCEEDINGS ^--r^frSf^^;^'^ OF THE ^'«j#^^ % N\ BIOLOGICAL SOCIETY OF WASHINGTON At A REVISION OF THE OSMERID FISHES OF THE NORTH PACIFIC. BY CARL L. HUBBS. The family of Osmeridae, or true smelts, is confined to Arctic and North Temperate waters. Like many other famihes of the Holarctic Realm, it is represented by more genera and species in the North Pacific than in the North Atlantic. The genus Osmerus alone is better developed in the latter region, where otherwise only one species, Mallotus villosus, occurs. A species of Osmerus, as well as Mallotus villosus, also occurs, how-ever, along the Arctic coasts and also in the North Pacific. In addition, Allosmerus attenuatus, Thaleichthys pacificus, three species of Spirinchus and four species of Hypomesus characterize the North Pacific fauna. They are all compared in the follow-ing key. In the preparation of this paper, nearly all the material pre-served in American museums has been examined. We wish to thank the authorities of the National Museum, in particular, for the privilege of examining the specimens deposited in that institution. Key to the Genera and Species of Osmeridae. ^ a^. Scales of moderate size (fewer than 80 in the lateral line); scales on sides not forming villous bands in the breeding male. b^ Teeth on the vomer canine-like, few in number, and not cover-ing the whole head of the bone, c^ Vomerine teeth confined to lateral tips of U-shaped vomer, fang-like, one to three in number on each side; teeth iWith the exclusion of the Atlantic species of Osmerus and of Therobromus callorhini Lucas, known only from bones taken from the stomachs of fur seals, and perhaps not an Osmerid. 14— Peoc. Biol. Soc. Wash., Vol. 38, 1925. (49)
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