22 
THE CONDOR 
Vol. XV 
Aetitis macularius. Spotted Sandpiper. Seen occasionally on rocky shores. 
One specimen taken at Cerros Island April i8. 
Nnmenius hudsonieiis. Hiidsonian Curlew. Common at San Geronimo Is- 
land April 13-14, and at China Point (about thirty miles south of Todos 
Santos Island), April 25. 
Squatarola squataroia. Black-bellied Plover. Common at San Geronimo Is- 
land April 13-14. 
AEgialitis nivosa. Snowy Plover. Common at San Geronimo Island April 
0-14- 
Aphriza virgata. Surf-bird. Female taken by Linton at San Geronimo Is- 
land April 13; another female taken by Child the same day. 
Arenaria interpres morinella. Ruddy Turnstone. Common at San Geronimo 
Island April 13-14. Several specimens taken. 
Arenaria melanocepliala. Black Turnstone. Abundant everywhere 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 16. The male was almost typical frazari and 
the female almo.st typical bachiiiani. 
Lophortyx californica 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. pair seen at Colnett, and another pair 
on San Martin Island. 
Haliaeetus leucocephalus leueocephalus. Bald Eagle. One or two birds seen 
at north end of Cerros Island. 
Falco peregrinus anatum. Duck Hawk. Male taken on San Martin Island 
April 10. Male, female and three badly incubated eggs taken on San Geronimo 
Island April 13. Several birds seen on Cerros Island. 
Falco 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 Aveeks old, so the eggs must have been laid in Janu- 
ary. An addled egg, taken 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 pratineola. 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 14. 
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 14, and another at the south end of Cer- 
ros Island April 17. 
