AMEKICAiN lIKHl'.INii (jirLL. 45 



STERNA TRUDEAUI. 

 Trudeau's Tern. 



8te1!Xa TKiDE.ui AuD. Orn. IJiog. 

 DESCRIPTION. 



Sp. Cii. Size, a little larger tlian tliat of Forsteu's Tern Imt the fVirin is similar, the tail being deeplj' 

 forked. 



Cor.OR. Adult in Summer. Head, under nortion of -iving.-;. and under tail eovert.s. white. There is a 

 dusky line on the sides of head, entii'ely surrounding eye and extending over ear coverts. Remainder of 

 idamagc. ])earl gray, lightest on wing (juills. ]>ili. lilaek. yellow at liaso ami tip. 



Winter adult. Similar to the summer dress, hut white beneath, and the bill is more dusky. 



OBSERA'ATIONS. 



Readily distinguished by tho '.vliolly w hite cr^wn and dusky stripe on the side of liead. Occurs on the 

 Atlantic coast of South America : accidental on our coast. 



DIMENSIONS. 



Length, bVOi) to 1(!-(X): wing. :t-."-0 to lUdH: tail, 4-!") to -VZO ; bill, I'.^O to ITO: tarsus, -fiO to -95. 



HABITS. 

 The only elaitii tliiit this species has to a place in our fauna, rests upon a specimen, 

 ,( the type) taken many years ao'o, 1)}' Audubon, on the coast ofNew Jersey. 



LARUS ARGENTATUS SMITHSONIANUS. 

 American Herring Gull, 



Larus SM1T1I.S0NIANUS CoiKs, Pr. Ac. Nat. Sc. Philad., lsii2, ii. 290. 



DESCRIPTION. 

 In the article on the Herring Gull, in the first edition of this work, I did not separate the American 

 sub-species from the Eun.ipean. as is now almost universally done by auth'jrs on this side of tJie Atlantic. 

 1 now think that the American birds differ sufficiently from the European to warrent separatii n. The de- 

 scription given on page '2'i apjdies to the American sub-species. The European Herring Gull differs from 

 the American in having the wdiite near the ends of the outer primaries extending to the extreme tip. with- 

 ■out being interrupted by a black band, as in the American bird, or if there is a band, it is not continuous. 

 Tlie average size of both forms appears to be similar. Gulls with the wing markings of European birds are 

 most certainly occasionally taken on our coast, but whether such specimens are stragglers from the eastern 

 side of the Atlantic, or whether they arc only examples of American birds which show an apjiroach toward 

 the allied form on the other side of the water, through presagement or reversion — depending on which form 

 may be the original stock — is a matter difficult to determine. 



LARUS CAMUS. 



Mew Gull. 



Larus OANUS Linn. Syst. Nat..L iriK". p. •_'L'4. 



DESCRIPTION. 



Sp. Ch. Size, medum. Form, rather slender, about that of L. delawarensis but the bill is not ([uite 

 as stout. 



Color. Adult. Rack and wings pearl gray, darker than in the Herring Gull. Remainder of plu- 

 mage, white. Quills, broadly tipped and banded, subterminally, with black. Iris, white. Rill and feer. 



