12 Bulletin American Museum 0} Natural History [Vol. XLVIII 



iEgialites semipalmata (Bonaparte) 

 Semipalmated Plover 

 Abreojos Point, March 16, Tiburon Island, April 12, two specimens. 



ASgialitis nivosa Cassin 

 Snowy Plover 

 Abreojos Point, March 16, Magdalena Bay, March 20, and Carman 

 Island, April 23, eight specimens. 



Ochthodromus wilsonius (Ord) 

 Wilson's Plover 

 La Paz, March 27, one specimen. 



Aphriza virgata (Gmelin) 

 Surf-bird 



The surf-bird probably winters in considerable numbers in the 

 Lower California and Gulf region, having been taken at Abreojos Point 

 on the Pacific side of the peninsula on March 16, at San Josef Island in 

 the Gulf on March 31, and at Tiburon Island off the coast of Sonora on 

 April 12. Twenty or more were seen at San Josef Island. 



It is not mentioned by Bryant, or Brewster, nor in an}?- of the papers 

 on Lower California birds with which the writer is familiar. Although its 

 migration route extends from Alaska to Chili, it has never been recorded 

 as common anywhere, and its breeding range is still unknown. So far as 

 observed by the writer, it frequents low rocks along shore that are almost 

 a-wash. All that were seen were comparatively fearless, showing little 

 concern when approached. 



Arenaria melanocephala (Vigors) 

 Black Turnstone 

 San Roque Island, March 15, Abreojos Point, March 16, and 

 Tiburon Island, April 12, five specimens. 



Hsematopus frazari Brewster 

 Frazar's Oyster-catcher 

 San Benito Islands, March 9, Cerros Island, March 10, Magdalena 

 Bay, March 20, San Josef Island, March 31, and San Esteban Island, 

 April 1, seven specimens. 



The oyster-catcher was observed at Agua Verde Ba}', April 1, 

 Angel Guardia Island, April 10, and Santa Catalina Island, April 16. 

 A nest and eggs were found at Concepcion Bay, April 7. 



