26 PACIFIC COAST AVIFAUNA No. 12 
W. Anthony (7) says that during the winters of 1896, 97 and 98 he found it of 
regular though not common occurrence about Los Coronados Islands. As these 
birds keep well away from the shore, they are more easily overlooked than are 
the other gulls. 
WT Larus glaucescens Naumann 
GLAUCOUS-WINGED GULL 
Larus glaucescens (1) Grinnell, Pasadena Acad. Sci., 11, 1898, p. 6. (2) Breninger, Auk, 
xx, 1904, p. 219. (3) Howell and van Rossem, Condor, x1, 1911, p. 209. (4) Wil- 
lett, Pac. Coast Avif., 7, 1912, p. 18. (5) Cooke, U. S. Dept. Agric., Bull. 292, 1915, 
Do 2s 
A regular though not plentiful winter visitant. G. F. Breninger (2) noted 
immature birds but no adults at San Clemente during February, 1903, and D. R. 
Dickey, L. M. Huey and I saw one or two immatures daily during our visit to 
the same locality from March 22 to April 11, 1915. J. Grinnell (7) recorded the 
species from Catalina in December, 1897, and on May 1, 1911, A. van Rossem (3) 
saw three individuals at close range on Santa Cruz Island. 
18. Larus occidentalis Audubon 
WESTERN GULL 
Larus occidentalis (1) Cooper, Proc. Calif. Acad. Sci., rv, 1870, p. 79. (2) Baird, Brewer 
and Ridgway, Water Birds N. Am., 1, 1884, p. 231. (3) Streator, Proc. Sta. Barbara 
Soc. Nat. Hist., 1, 1887, p. 22. (4) Blake, Auk, tv, 1887, p. 329. (5) Streator, Orn. 
& Ool., xm, 1888, p. 53. (6) Saunders, Cat. Birds Brit. Mus., xxv, 1896, p. 258. (7) 
Grinnell, Pasadena Acad. Sci., 1, 1897, p. 28. (8) Grinnell, Pasadena Acad, Sci., 11, 
1898, p. 6. (9) Grinnell, Pac. Coast Avif., 3, 1902, p. 12. (10) Grinnell and Daggett, 
Auk, xx, 1903, pp. 30, 37. (11) Breninger, Auk, xxr, 1904, p. 219. (172) Anthony, 
Auk, xxi, 1906, p. 135. (13) Mearns, Bull. U. S. Nat. Mus., ivr, 1907, p. 141. (14) 
Linton, Condor, x, 1908, p. 125. (15) Wright, Condor, x1, 1909, p. 98. (76) Osburn, 
Condor, x1, 1909, p. 198. (17) Linton, Condor, x1, 1909, p. 193. (178) Willett, Condor, 
x11, 1910, p. 178. (79) Osburn, Condor, x11, 1911, p. 32. (20) Burt, Condor, x11, 
1911, p. 164. (21) Willett, Pac. Coast Avif., 7, 1912, p. 14. (22) Wright and Snyder, 
Condor, xv, 1913, pp. 86, 89. (23) Grinnell, Pac. Coast Avif., 11, 1915, p. 21. (24) 
Cooke, U. S. Dept. Agric., Bull. 292, 1915, p. 34, 
Larus argentatus var. occidentalis (25) Henshaw, Rep. Wheeler Surv., 1876, p. 276. 
Western Gull (26) Willett, Condor, x11, 1910, p. 171. 
Permanent and abundant resident, breeding on all islands that are not in- 
fested with foxes, and when the latter condition prevails, on the nearby detached 
rocks. The Western Gull begins selecting a nesting site the first part of April, 
and eggs are usually deposited during the last week in that month and first of 
May. Some of the young are able to fly by the first of July, but, of course, if a 
first set is destroyed, unfledged young may be found late in the summer. 
During the fall and winter occidentalis is a highly valued citizen, but I defy 
anyone to visit a breeding colony and not wish, in the heat of anger, that every 
bird of the species might drop dead. If a colony of cormorants, pelicans or 
murres is disturbed, there is always a cloud of the larine robbers ready to pounce 
on the unprotected eggs, and puncture as many of them as possible. They are 
