Doug Bell 1986 Catalogue 5 May 1986 Alcatraz Island, S.F. Co., Calif. 172388 SKELETON 067 Lft. wing ♂ Larus occidentalis. Eye-ring, bill deep yellow. Legs pale pink. Irides - pearl w/ magenta flecking ventrally [illegible] light flecking - dark brownish. Adult plumage, except for tail - 12 largely white rectrices except for darkish quills over proximal 2/3 (9 quills). One rectrix has dark over long. half of barbs. Wing chord: 132.7mm WT. 1,040gms. Protruding keel, very little meat on synsacrum. Stomach: 2 pinchers of an invert. Collected by hand - has broken wrist. No broad patches. Rt. T: 16.0 x 11.5 x 10.0 mm L. T: 16.0 x 9.5 x 9.0mm - Tissues taken: MLHK. 30 May 1986 - Alcatraz I., SF. Bay CA 172389 068 ♀ Larus occidentalis WT = 972g (1,090-) 118gms clt Wing: 37.4, P° 10: 27.2 9: 27.8 8: 27.4 7: 26.5 6: 24.9 5: 23.1 Tail: 14.9 Tarsus: 6.24 cm Bill: 4.6gms 1.94; ant. Nares: 1.99 Post Nares: 1.92, Eulmen 5.27 Bell width 1.36 Head 11.95 - legs: Vinaceous (No 5) Bill: Orange yellow .(17) Eye ring: Orange yellow 17, Irides: Sulphur yellow Tissues: LHK 3 Pictures: 2 heads, 1 body, 3 broad patches, Mate of 069 Stomach empty. Left ovary: 19ova > 3mm & 172390 069 ♂ Larus occidentalis WT. 1150 gms SKELETON + L Wing L Wing: P° 10 - 29.4 9 - 29.8 8 - 29.2 7 - 27.4 6 - 25.7 5 - 22.8 Wing: 43.2 Tail: 16.4 Tarsus 6.39 Bill: Culmen: 6.385 Width: 1595 Gonyx: 2.16 ant N: 2.255 Post N: 2.28 Head: 13.37 Mate of 068. Legs: vinaceous [5], Bill & Eye-ring: Orange yellow (17) Irides: Sulphur yellow Tissues: LHKM Trapped off 3 egg nest. Testies: L: 1.5 x 1.2 x .8 mm R: 1.55 x 1.0 x .8 mm Stomach - fish ribs & vertebrae, otherwise empty.