BIRDS OF NORTH AND MIDDLE AMERICA. 657 
shaded or suffused along edges of rectrices with blackish, and crossed 
by a broad subterminal band of blackish (this nearly disappearing 
on lateral rectrices), and with more or less distinct terminal spots of 
gray. 
Immature (younger).—Head, neck, chest and most of upper parts 
sooty grayish brown, the scapulars, interscapulars and wing-coverts 
with paler margins; rump uniform grayish brown; upper tail-coverts 
light gray with indistinct terminal spots of brownish; tail dull slate- 
black fading in to dull gray basally, especially on inner webs, the lateral 
rectrices with more than basal half of inner web light gray; under 
parts deep sooty gray or grayish brown laterally, lighter brownish 
gray clouded with a more decided brown hue medially, becoming 
pale brownish gray on anal region; under tail-coverts brownish gray 
becoming paler on margins; bill, legs and feet black. 
Adult male.—Wing, 342-359 (350.3); tail, 143-148 (144.3); ex- 
posed culmen, 40-44.5 (43); greatest depth of bill, 12.7-14 (13.4); 
tarsus, 52-58.5 (55.8); middle toe, 42.5-44.5 (43.6).¢ 
Adult female.—Wing, 308.5-343 (330.1); tail, 129-143 (137.1); 
exposed culmen, 40-41.5 (40.8); greatest depth of bill, 12.7-14 (13.1); 
tarsus, 50-55.5 (52.8); middle toe, 39.5-43 (41).° 
Galapagos Archipelago (Abingdon, Albemarle, Barrington, Bind- 
loe, Brattle, Champion, Charles, Chatham, Cowley, Crossman, 
Daphne, Duncan, Hood, Indefatigable, near James, Jervis, Nar- 
borough, Seymour and Tower Islands.) 
Larus fuliginosus Gouup, Zool. ‘Beagle,’ iii, 1841, 141 (James Island, Galapagos 
Archipelago; coll. Brit. Mus.?).—Gray, List Birds Brit. Mus., Anseres, 
1844, 170, part (Galapagos).—SuNDEVALL, Proc. Zool. Soc. Lond., 1871, 125 
(Charles and Indefatigable islands, Galapagos)—SciaTER and Savin, Proc, 
Zool. Soc. Lond., 1871, 573 (monogr.).—Satvin, Trans. Zool. Soc. Lond., 
ix, 1876, 505, pl. 87 (Indefatigable, Abingdon, and Charles islands, Galapagos; 
habits).—Saunpers, Proc. Zool. Soc. Lond., 1878, 184 (monogr.); Journ. 
Linn. Soc., Zool., xiv, 1878, 396 (range); Cat. Birds Brit. Mus., xxv, 1896, 222 
(James, Abingdon, and Indefatigable islands).—Ripeway, Proc. U.S. Nat. 
Mus., xii, 1890, 116 (Indefatigable, James, and Chatham islands); xix, 1896, 
635 (Charles; Chatham, Barrington, Indefatigable, James, Bindloe, and 
Abingdon islands; descr.; synonymy; etc.).—Baur, Am. Nat., xxxi, 1897, 
782 (Albemarle Island), 784 (Jervis Island).—Rotuscuitp and Harrert, 
Novit. Zool., vi, 1899, 111 (Abingdon Island), 129 (Albemarle Island), 135 
(Tower Island), 189 (Abingdon, Bindloe, James, Indefatigable, Barrington, 
Chatham, Charles, Albemarle, Jervis, Tower, and Hood islands; descr. eggs); 
ix, 1902, 418 (Albemarle, Indefatigable, and Seymour islands; habits), 418 
(Galapagos).—Snoperass and Heiuer, Proc. Wash. Acad. Sci., v, 1904, 237 
(range, notes, etc.).—GuirrorD, Proc. Calif. Ac. Sci., 4th ser., ii, pt. i, 1913, 
42 (Abingdon, Albemarle, Barrington, Bindloe, Brattle, Champion, Charles, 
Chatham, Crowley, Crossman, Daphne, Duncan, Hood, Indefatigable, near 
James, Jervis, Narborough, Seymour, and Tower islands, Galapagos; habits, 
etc.). 
@ Five specimens. b Hight specimens. 
40017—19—Bull. 50, pt S——43 
