15. LARus. 273 



near the tip of the 4th tail-feather from the outside : bill dull 

 j'ellow, with a black band reaching to behind the angle ; tarsi and 

 toes paler than in the adult. No earlier state of plumage is known 

 to me. 



hah. Western Mediterranean, chiefly within the Tyrrhenian 

 Sea, but as far as the Straits of Gibraltar and a little outside. A 

 thorough " sea " gull, nesting on rocky islets. 



a. Ad. sk. Corsica. Riocour Coll. 



b. Ad. St. Straits of Bonifacio. Purchased. 



c. 2 ad. sk. Maddalena I., Strs. Bonifacio, H. Seebohm Coll. 



May 3, 1882 (Lord Lilford). 



d. e. 6 2 ad. sk. Spargi I., Strs. Bonifacio, May 13 Lord Lilford [P.]. 



(Lord Lilford). 

 f. $ ad. sk. Spargil., Strs. Bonifacio, May 13 H. Saunders Coll. 



(Lord Lilford). 

 y. d imra. sk. Palermo, Sicily, Feb. 1866 H. Saunders Coll. 



(Doderlein). 



36. Lams delawarensis. 



Larus delawarensis, Ord, Guthrie s Geixjr., 2nd Amer. ed. ii. p. 319 

 (181o : Delaware R.) ; Baird, Cass., ^- Lawr. B. N. Amer. p. 846 

 (1858); Coues, B. N.-West, p. 036 (1874) ; Baird, Max. Bound. 

 Suri\ p. 27 (1859) ; Cooper ^- Sucidey, N. H. Wash. Terr. p. 273 

 (1860) ; Wheeler, Jiejh Krp. ^- Surr. W. of 100th Mer. p. 485 

 (1876) ; Blakiston, Ibis, 18(;2, p. 10 (Saskatchewan) ; Alle7i,Bull. 

 Harv. Coll. ii. p. 366 (1871 : tlorida) ; id. Bull. Harv. Coll. iii. 

 p. 183 (1873 : Gt. Salt Lake) ; Ridi/w. Aim. Lijc. N. Y. x. p. 391 

 (1874: Illinois); Coues, Key N. 'Amer. B. p. 313 (1872); id. 

 Check-l. no. 648 (1873) ; Lawr. Mem. Bast. &oc. N. H. ii. p. 317 

 (1874: Mazatlan); Heiish. Ann. Li/c. N. Y. xi. p. 13 (1874: 

 Utah); id. Eep. Zool. Expl. \00th Merid. p. 485 (1885); Laur. 

 Bidl. U.S. Aat. Mus. iv. p. 51 (1876 : Tehuantepec) ; Ridyw. 

 Rep. Surv. -iOth Par. p. 638 (1877) ; Reid, Zooloy. 1877, p. 489 

 (Bermuda, once) ; Sennett, Bull. U.S. Geol. Surv. iv. p. 64 (1878 : 

 Galveston) ; Coues, t. v. p. 655 (Dakota) ; Saunders, P. Z. S. 1878, 

 p. 176 (revision Larinfe) ; Hensiunc, Rep. Surv. 1879 W. oflOOfh 

 Merid. p. 331 (1880) ; Ridytv. Bull. U.S. Nat. Mus. no. 21, p. 52 

 (ISSI); Maynard, B. East. N. Amer. p. 485 (1881); Coues, 

 Check-l. N. Amer. B. 1882. p. 21 ; Ridyw. Cat. B. Fish. E.ihib. 

 p. 31 (1883); Coues, Key IS!. Amer. B. 2nd ed. p. 745 (1884); 

 S. G. Reid, Bull. U.S. Nat. Mus. no. 25, p. 2G0 (1884 : Bermuda) ; 

 Baird, Brewer, ^- Ridyiv. Water-B. N. Amer. ii. p. 244 (1884) ; 

 Drew, Auk, 1885. p. 18 (Colorado) ; Hensh. t. c. p. 232 (Caia.) ; 

 A. O. U. Check-l. N Amer. B. p. 90 (1888j ; Feilden, Tr. Norw. 

 Soc. iv. p. 351 (1887 : Hudson Bay) ; Ridgio. Man. N. Amer. B. 

 p. 32 (1887) ; Cooke, Rep. B. Miyr. Mississippi Tall. p. 56 (1888) ; 

 Thomps. Pr. U.S. Nat. Mus. xiii. p. 468 (1890 : Manitoba). 



Larus canus (part.), Bp. Specchio Comp. p. 69 (1827) ; id. Ann. Lye. 

 N. Y. ii. p. 359 (1828). 



Larus argentatoides {nee Brehni), Bp. Ann. Lijc. N. Y. ii. p. 360 

 (1828: New York). 



Larus zonorhvnchus, Richardson, Faun. Bor.-Atner., Birds, p. 421 

 (1831) ; Niitt. Man. Orn. ii. p. 300 (1834) ; Bp. Comp. List, p. 63 

 (1838) ; Audub. Orn. Bioyr. iii. p. 98 (1835), v. p. 638 (1839) ; id. 



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