584 APPENDIX. 
1.60-1.65), culmen .98~1.08, tarsus 1.15-1.28, middle tos, with claw, 1.48- 
1.65. Hab. Northwestern Pacific (Bonin Islands, etc.). 
Z. hypoleuca Satv. Bonin Petrel. 
(6.) Page 71, after O. homochroa: 
—. Oceanodroma socorroensis TowNsEND. Socorro Petrel.’ 
Similar to O. homochroa, but rather larger; wing decidedly longer; tail 
shorter and less deeply forked, with lateral feathers decidedly broader; bill 
longer ; coloration perceptibly darker, especially the under parts, the under wing- 
coverts without the light-colored patch always conspicuous in O. homochroa ; 
shorter lateral upper tail-coverts pale gray, sometimes whitish, producing a more 
or less conspicuous light-colored patch on each side. Wing 5.80-6.38 (6.11), tail 
3.07-3.42 (3.22), forked for .71-.92 (.77), culmen .58-.65 (.62), nasal tubes .23-.29 
(.27), tarsus .82-.95 (.90), middle toe, with claw, .88-.93 (.90). Hab. Socorro 
Island, Revillegigedo group, and Coronados Island, Lower California. 
(7.) Page 71, after O. cryptoleucura: 
106.1. Oceanodroma macrodactyla (Bryant). Guadalupe Petrel.’ 
Similar to O. cryptoleucura, but much larger, the tail much more deeply 
forked, fect proportionally larger, and rectrices not extensively, if at all, white 
at the base; length about 8.40, wing 6.10-6.70, tail 3.30-3.90 (forked for .90- 
1.40), culmen .60, tarsus .86-1.00, middle toe, with claw, 1.10-1.18. Hab. Guada- 
lupe Island, Lower California. 
(8.) Page 75, after S. cyanops: 
141.1. Sula nebouxii Mitnze-Epwarps. Blue-footed Booby.* 
Head, neck, and entire under parts white, the first two streaked with sooty 
grayish; back and scapulars dusky brownish, the feathers tipped with whitish ; 
legs and feet deep blue in life. (Young unknown.) Length about 32.00-34.50, 
wing 15.50-17.50, tail 8.00-10.00, culmen 3.98-4.55, tarsus 1.85-2.30, middle toe 
2.65-3.05. Hab. Pacific coast, from Gulf of California to the Galapagos Archi- 
pelago and coast of Chili. 
9.) Page 75, after “d'. Feet greenish or yellowish” cancel what follows and 
substitute : 
é. Color of head and neck uniform dark sooty brown, in both sexes, abruptly 
defined above against the lighter brown of the back. Hab. Tropical and 
subtropical waters on the Atlantic side of America, north to Georgia; 
also various parts of eastern hemisphere... 115. S. sula (Linn.). Booby. 
1 @strelata hypoleuca Savin, Ibis, July, 1888, 359 (Krusenstern Island). 
2 Oceanodroma socorroensis Towns., Proc. U. S. Nat. Mus. xiii. No. 799, Sept. 9, 1890, 134. 
8 Oceanodroma leucorhoa macrodactyla Bryant, Bull. Calif. Acad. Sci. ii. No. 8, July 23, 1887, 450. 
—Oceanodroma macrodactyla A. O. U., Check List, abridged ed. 1889, No. 106.1. 
4 Sula nebouxtt Mitne-Epw., Ann. Soc. Nat. Zool. 52, Ann. vi. ser. T, xiii, No, 2-4, Art. 4, p. 37, pl. 14 
(Chili).— Sula goseti Rivaw., Auk, v. July, 1888, 241 (Gulf of California). 
