1878.] 



MR. H. SAUNDKRS ON THIS LARIN.E. 



207 



(1831); Thompson, B. of Ireland, hi. p. 317 (1851), near Belfast; 

 Schlegel, Mus. P.-Bas, Larl, p. 41 (1863). 



Xema bonapartii, Bp. Birds of Eur. and N. Am. p. G2 (1838). 



Ghroicocephalus bonapartii, Bruch, J. f. Qrn. 1853, p. 105, et 

 1855, p. 292. 



Chroicocephalus subulirostris, Bp. ; Bruch, J. f. Orn. 1853, p. 105 

 (type in Mainz Mus. examined, H. S.). 



Gavia bonapartii, Bp. Naumannia, 1854, p. 213. 



Gavia subulirostris, id. torn. cit. p. 213. 



Fig. 16. 



1. 2. 3. 



Three outer primaries of L. Philadelphia, jr. 



Chroicocephalus Philadelphia, Lawr. B. N. Am. p. 852 (1858); 

 Dall & Bann. Tr. Chicago Ac. 1869, p. 305 (Alaska); Newton, 

 P. Z. S. 1871, p. 57, pi. iv. fig. 6, egg (Arctic America). 



Gavia bonapartei, Blasius, J. f. Orn. 1865, p. 371. 



Larus Philadelphia, Allen, Am. Nat. iii. p. 643 (Salt Lake) ; 

 Harting, Handbk. Brit. B. p. 172 (1872); Beid, Zoologist, 1877, 

 p. 489 (Bermudas 1 ). 



Hab. British North America and Alaska (in summer), breeding 

 on the Yukon and neighbouring localities. In autumn it descends 

 the coasts of America, as far as California on the west and North 

 Carolina on the east ; as a straggler it has visited the Bermudas and 

 also the British Islands. 



The drawing (fig. 16) of the outer primaries in the young shows 

 wherein the pattern differs from those of allied species. In the adult 

 the distinctions are yet more marked. 



[53] 



