[13] FISHERIES OF THE UNITED STATES. 399 



names merely to give them a prominence which they would not secure 

 if they were merged with the typical forms under which they would be 

 considered in a systematic treatise. Such are the following: 



Goregonus artedi subsp. sisco. 



Salmo salar subsp. sebago. 



Salmo spilurus subsp. pleuriticus. 



Salmo purpuratus subsp. virginalis. 



Salmo purpuratus subsp. henshawi. 



Salvelinus namaycusli subsp. siscowet. 

 The following species are not included in the collection : 



Osmerus attenuatus. 



Hypomesus olidus. 



Argentina syrtensium. 



Goregonus Jcennicottii. 



Goregonus tullibee. 



Salmo stomias. 



Salvelinus naresii. 



Salvelinus arcturus. 



Salvelinus rossii. 



Salvelinus nitidus. 



Salvelinus stagnalis. 

 Osmerus attenuatus is not represented in the United States National 

 Museum by a single authenticated example. There are two headless 

 specimens from San Francisco, which have been identified with Lock- 

 ington's species. Certain others from Washington Territory, which 

 were labeled " Osmerus attenuatus," are certainly Hypomesus pretiosus. 

 We have also two smelt from San Francisco, which are marked u Osme- 

 rus elongatus Ayres." It appears to me that Osmerus attenuatus Lock- 

 ington is very doubtfully distinct from Hypomesus pretiosus (Girard), if 

 not identical with that species. Again, it has not been proven that 0. 

 elongatus is identical with H pretiosus, and I have reason to believe 

 that if an Osmerus different from thaleichthys and pretiosus is found in 

 the San Francisco markets, it will prove to be elongatus of Ayres, and 

 Lockington's attenuatus will become a synonym of elongatus. 



Hypomesus olidus is exhibited in the Alaskan series } it is not well 

 represented in the collection, only one person having obtained a few 

 examples. 



Argentina syrtensium is known from the type specimen only, and this 

 was ejected from a fish stomach. 



Goregonus Jcennicottii is one of the large white-fishes of Alaska ; it is 

 closely related to G. clupeiformis, the common species of the Great 

 Lake region, differing from this chiefly in having the head somewhat 

 shorter, with shorter jaws, and in the greater number of scales. Mr. 

 Dall states that it abounds in both winter and summer, spawning in 

 September in the small rivers falling into the Yukon.* 

 * Rep. Comr. Agric, 1870 (1871), p. 386. 



