BIRDS OF NORTH AND MIDDLE AMERICA. 661 



Advlt male.—Wmg, 390-434 (416.8); tail, 169-202.5 (189.3); 

 exposed Culmen, 46.2-53.5 (50.8); depth of bill at gonydeal angle, 

 12.4-14.2 (13.1); depth of bill at base, 16.5-18.5 (17.5); tarsus, 

 48-56 (52.7); middle toe, 46.2-53.3 (50.7). « 



Adult female. —Wing, 406.5-425 (414.3); tail, 182.5-205 (193); 

 exposed culmen, 48.5-51.5 (49.7); tarsus, 47-51 (48.9); middle toe, 

 45.7-52 (48.4).^ 



Galapagos Archipelago (Albemarle, Barrington, Brattle, Cham- 

 pion, Charles, Chatham, Cowley, Grossman, Culpepper, Dalrymple, 

 Daphne, Delano, Enderby, Gordon, Guy Fawkes, Hood, Indefati- 

 gable, James, Kicker, Narborough, Seymour, Tower, and Wenman 

 islands); casual off coast of southern CaUfornia (Monterey Bay; off 

 San Diego, April 14, 1895) ?, on Malpelo Island, off Bay of Panama 

 (March 5, 1891) and on coast of Peru (Paracas Bay, Oct.). 



Larus furcatus Neboux, Rev. ZooL, 1840, 290 ("Monterey" [r'alifornia] ; coll. 

 Paris Mus.); Voy. 'Venus,' Atlas, 1842, pi. 10. — Prevost and Des Murs, 

 Yoy. 'Venus,' Ois., 1855, 277. 



[Xema] furcatus Bruch, Journ. fur Orn., 1853, 10;^ ("Californien"'). 



[Xema] fiircatum Gray, Hand-list, iii, 1871, 117. no. 11014. — Coues, Key N. 

 Am. Birds, 1872, 317. 



Xema fur catum Coues, Check List, 1873, no. 559; Bii-ds Northwest, 1874, 661 

 (monogr.). — Saunders, Proc. Zool. Soc. Lond., 1878, 210 (monogr.); 1882, 

 523, pi. 34 (Paracas Bay, Peru, Oct.; descr. and colored plate of young). — 

 Taczanowski, Orn. du Perou, iii. 1886, 457. — Streets, Auk, xxix, 1912, 

 233 (off Chatham Island, Galapagos, habits). 



Xema fur cata Coues, Check List, 2d ed., 1882, no. 791. — Baird, Brewer, and 

 RiDGWAY, Water Birds N. Am., ii, 1884, 273.— Saunders, Cat. Birds 

 Brit. Mus., XXV, 1896, 165 (Dalrymple Rock, near Chatham Island, Gala- 

 pagos: Paracas Bay, Peru). — Rothschild and Hartert, Novit. Zool., vi, 

 1899, 190 (Wenman, Culpepper, Tower, and Hood Islands, Galapagos Archipel- 

 ago; descr. nest and eggs); ix, 1902, 412 (Wenman, Daphne, Guy Fawkes, and 

 Albemarle islands, Galapagos; habits; descr. nest, eggs, young, etc.), 418 

 (Galapagos). 



X[ema\furcata Coues, Key N. Am. Birds, 2d ed., 1884, 753.— Ridgway, Man. N. 

 Am. Birds, 1887, 38.— Rothschild and Hartert, Novit. Zool., vi, 1899, 204 

 (Galapagos). 



\Xema\furcala Forbes and Robinson, Bull. Liverp. Mus., ii. no. 2, 1899, 56. 



Xema (Creagrus) furcala American Ornithologists' Union, Check List. 1886, 

 350 (Hypothetical List. no. 4). 



[Creagrus] furcatus Bonaparte. Naumannia, 1854, 213; Compt. Rend., xlii, 1856, 

 771.— Bruch, Journ. fur Orn., 1855, 292.— Sharpe. Hand-list, i, 1899, 139. 



Creagrus furcatus Lawrence, in Baird, Rep. Pacific R. R. Surv., ix, 1858. 857. — 

 Baird, Cat. N. Am. Birds, 1859, no. 679. — Coues, Proc. Ac. Nat. Sci. Phila., 

 1862, 312 (monogr.). — Blasius, Journ. fur Orn., 1865,370 (crit.). — Salvin, 

 Trans. Zool. Soc. Lond., ix, 1876, 506 (Dalrymple Rock, Chatham I., Gala- 

 pagos).— Ridgway, Proc. U. S. Nat. Mus., iii. 1880, 207 (Cat. N. Am. Birds, 

 no. 678); xii, 1890, 117 (Chatham I., Galapagos; full description); xix. 1896, 

 638 (Brattle, Hood, Chatham, off James, and Tower islands, Galapagos; Malpelo 

 I., off Bay of Panama; etc.; descr., measurements, etc.); Nom. N. Am. 



a Thirteen specimens. b Five specimens. 



