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 22 THE CONDOR Vol XV Actitis macularius. Spotted Sandpiper. Seen occasionally on rocky shores. One specimen taken at Cerros Island April I8. Numenius hudsonions. Hudsonian Curlew. Common at San Geronimo Is- land April t3-t4, and at China-Point (about thirty miles south of Todos Santos Island), April 25. Squatarola squatarola. Black-bellied Plover. Common at San Geronimo Is- !and April 3-4. AEgialitis nivosa. Snowy Plover. Common at San Geronimo Island April t3-I4. Aphriza virgata. Surf-bird. Female taken by Linton at San Geronimo Is- land April I3; another female taken by Child the same day. Menaria interpres morinella. Ruddy Tumstone. Common at San 'Geronimo Island April t3-4. Several specimens taken. Menaria melanocephala. Black Turnstone. Abundant everyw!!ere on rocky shores. Many in almost full summer plumage. Haematopus frazari. Frazar Oyster-catcher. Fairly common on Cerros Is- land; one taken by Linton on San Geronimo. Haematopus bachmani. Black Oyster-catcher. Common on all the islands visited; also seen on the rocky shores of the mainland. On Cerros Island there are' very few oyster-catchers typical of either this or the last species, most of them showing hybridization between the two forms. A male and female, evi- dently paired, were taken April I6. The male was almost 'typical frazari and the female almost typical bachmani. Lophortyx oalifornica vallicola. Valley Quail. Common on the mainland. Zenaidura macroura marginella. Western Mourning Dove. Seen at 'Colnett. Cathartes aura septentrionalis. Turkey Vulture. Common on the mainland, and on San Martin and Cerros islands. Circus hudsonius. Marsh Hawk. A pair seen at Colnett, and another pair on San Martin Island. Haliaeetus leucocephalus leucocephalus. Bald Eagle. One or two birds seen at north end of Cerros Island. Palco peregrinus ariaturn. Duck Hawk. Male taken on San Martin Island April IO. Male, female and three badly incubated eggs taken on San Geronimo Island April 13. Several birds seen on Cerros Island. Palco sparverius phalaena. Desert Sparrow Hawk. Seen on the mainland. Pandion haliaetus carolinensis. American Osprey. One pair seen on San Geronimo; breeding abundantly on San Martin and Cerros. A few sets were secured, but nearly all the nests examined contained young. Some young birds found April 9 were at least six weeks old, so the eggs must have been laid in Janu- ary. An addled egg, aken from a nest which also contained two young, measures 2.86 x 1.93, by far the largest Osprey's egg I have ever seen. At the time of our visit the Ospreys seemed to be feeding almost altogether on flying fish, which were very plentiful around the islands. Aluco 'pratincola. Barn Owl. Seen by McCloskey at Colnett, and by Child on San Martin Island. Speotyto cunicularia hypogaea. Burrowing Owl. One seen by Lowe on San Geronimo Island April 4- Ceryle alcyon. Belted Kingfisher. Male taken by Child at santo Tomas, and female of a pair seen, taken by the writer at San Martin Island April 23. One bird seen at San Geronimo Island April 4, and another at the south end of Cer- ros Island April 7.