LARUS PHILADELPHIA. 



(BONAPARTE'S GULL.) 



Sterna Philadelphia, Ord, in Guthrie's Geogr. 2nd Amer. ed. ii. p. 319 (1815). 



Lams minutus (nee Pall.), Sabine, App. Frankl. Polar Sea, p. 696 (1823). 



Larus capistratus (nee Temm.j, Bonap. Spec. Comp. p. 69 (1827). 



1 Larus melanorhynchus, Temra. PI. Col. livr. 85, pi. 504 (1830). 



Larus bonap artii, Swains. Faun. Bor.-Am. ii. p. 425, pi. 72 (1831). 



Xema bonapartii (Swains.), Bp. Comp. List, p. 62 (1838). 



Gavia bonapartii (Swains.), Macgill. Brit, B. v. p. 610 (1852). 



Cliroicocephalus bonapartii (Swains.), Bruch, J. f. O. 1853, p. 105. 



" Chr otocephalus subulirostris, Bp.," Bruch, ut supra. 



Gavia (Melagavia) bonapartii (Swains.), Bonap. Naumannia, 1854, p. 213. 



Gavia {Melagavia) subulirostris, id., ut supra. 



Chroicocephalits Philadelphia (Ord), Baird, Cass., & Lawr. B. of N. Am. p. 852 (1858). 



Larus Philadelphia (Ord), G. R. Gray, Cat. Brit. B. p. 235 (1863). 



Larus philadelphicus, Turnbull, B. of E. Pennsylvania, p. 48 (1869). 



Larus (Chrcecocephalus) Philadelphia (Ord), Coues, B. of N.-W. p. 655 (1874). 



Chroecoc'ephalus Philadelphia (Ord), Coues, Proc. Phil. Acad. p. 41 (1871). 



Liarus Philadelphia? (Ord), Saunders, P. Z. S. 1878, p. 206. 



Figure notabiles. 



Temra. PI. Col. tab. 504 ; Swains. & Richards. Faun. Bor.-Amer. pi. lxxii. ; Audubon, Orn. 

 Biogr. pi. ccexxiv. ; id. B. of N. Am. 8vo ed. pi. ccccxlii. ; Gould, B. of Great Britain, v. 

 pi. lxv. 



Ad. ptil. mst. capite et collo plumbescenti-nigris : oculis, parte antica excepta, albo marginatis : collo imo 

 albo : stragulo saturate cano : supracaudalibus, cauda et corpore subtus albis : remige prima in pogonio 

 externo et ad apicem nigra, in parte reliqua alba, secunda ad apicem nigra, tertia, et quarta albis nigro 

 subterminatis, albo apicatis et in pogonio interno canis, quints, et sexta canis nigro subterminatis, 

 septima et octava canis in pogonio interno versus apicem fumoso notatis : marginibus alarum et 

 subalaribus albis : rostro nigro : iride fusca : pedibus aurantiaco-rubris. 



Ad. ptil. hiem. similis, sed capite et collo albis cinereo notatis, regione parotica plaga cinerea, notata : pedibus 

 incarnatis. 



Juv. pileo f usco-cinereo : regione parotica saturate cinerea : corpore supra cervino-fusco notato et tectricibus 

 alarum cervino-fusco et fusco notatis : cauda alba, nigro terminate et cervino-albo anguste apicata. 



Adult Male (Hamilton, Ontario, April 22nd). Head and neck dark plumbeous black, a narrow white ring 



