66 U. S. BUREAU OF FISHERIES 



4Q5. Prosopium abyssicola (.Snyder). Bear Lake ichitefish. 

 Bear Lake, Idaho. 



Coregonus abyssicola Snvder, Bull. U. S. Bur. Fish., XXXVI, 1917-18 

 (May 7, 1919), 8, Bear Lake, near Fish Haven, Idaho. 



Genus 142. IRILLION Jordan. 



Irillion Jordan, Proc. Acad. Nat. Sci. Phila., LXX, 1918, 342 {Coregonus 

 oregonius Jordan and Snyder). 



426. Irillion oregonius (Jordan and Snyder). Chiselmouth jack. 



Mountain streams of Oregon tributary to the Columbia. 

 Coregonus oregonius Jordan and Snyder, Proc. U. S. Nat. Mus., XXXVI, 

 1911, 425, with fig., McKenzie River, Oreg. 



Family 49. THYMALLIDJE. Graylings 



Genus 143. THYM ALIUS Cuvier. Graylings. 



Thyinullus Cuvier, Regne Anim., ed. 2, II, 1829, 306 (Salnio ihymallus 



Linnff us) ; not Thymalus Latreille, 1802, a genus of Coleoptera. 

 Choregon Minding, Lehrbuch Naturgesch. Fische, 1832, 119 {Salmo 



thymallus L.) substitute for Thymallus, regarded as preoccupied. 

 Orthocolus Gistel, Thierreich, 1848, XI, 1838 {Salmo thymallus L.); 



substitute for Thymnllus, regarded as preoccupied. 



427. Thymallus signifer (Richardson). Arctic grayling; Poisson bleu. 



Mackenzie River to Alaska and the Arctic Ocean. 



Coregonus signifer Richardson, Franklin's Jour., 1823, 711; Winter 



Lake near Fort Enterprise. 

 Coregonus thymalloides Richardson, Fauna Bor.-Amer., Ill, 1836. 714, 



Winter River. 



428. Thymallus tricolor Cope. Michigan grayling. 



Streams of northern Michigan; formerly abundant in Au Sable River, 

 Jordan River, and other streams in the southern peninsula, and 

 Otter Creek, near Keweenaw, in the northern peninsula. 



IThymallus ontariensis Cuvier and Valenciennes, Hist. Nat. Poiss., 

 XXI, 1848, 452; said to have been brought by Milbert from Lake 

 Ontario; most likelv from Lake Geneva, Switzerland. 



Thymallus tricolor Cope, Proc. Acad. Nat. Sci. Phila., XVII, 1865, 80, 

 Au Sable River, Mich. 



429. Thymallus montanus Milner. Montana grayling. A hardy and attrac- 



tive aquarium fish. 

 Madison and Gallatin Rivers, Montana. 

 Thymallus montanus Milner, Rept. U. S. Fish Com., II, 1872-73 (1874), 



741, tributary of Missouri River at Camp Baker. 



Family 50. OSMERID.a:. Smelts 



Genus 144. MALLOTUS Cuvier. Capelins. 



Mallotus Cuvier, R^gne Anim., ed. 2, II, 1829, 305 {Clupea villosa 



Muller). 



430. Mallotus villosus (Miiller). Capelin; Lodde. 



Arctic America, south to Cape Cod and southern Alaska; Kamchatka. 

 Clupea villosa Muller, Prodr. Zool. Dan., 1777, 245, Greenland. 

 Salmo arcticus Fabricius, Fauna Groenlandica, 1780, 177, Greenland. 

 Salmo gronlandicus Bloch, Ichthyologie, VIII, 1794, pi. 99, Greenland. 

 Salmo socialis Pallas, Zoogr. Ross.-Asiat., Ill, 389, islands between 



Asia and America. 

 Osmerus microdon Cuvier and Valenciennes, Hist. Nat. Poiss., XXI, 



1848, 385, no locality. 



Genus 145. THALEICHTHYS Girard. Eulachon. 



Thaleichthys Girard, Pac. R. R. Surv., X, 1858, Fishes, 325 {T. stevensi 

 G\Tard = Salmo (Mallotus) pacificus Richardson). 



431. Thaleichthys pacificus (Richardson). Eulachon; Candlefish; Oolachan. 



Oregon to Alaska. 



Salmo {Mallotus) pacificus Richardson, Fauna Bor.-Amer., Ill, 1836, 



226, Columbia River. 

 Thaleichthys .stevensi Girard, Pac. R. R. Surv., X, 1858, 325, pi. 75, 



figs. 1-4, Puget Sound. 



