BREWSTER: BIRDS OF THE CAPE REGION, LOWER CALIFORNIA. 73 
in March on Santa Margarita Island, and it has been reported from Santa Ro- 
salia Bay. On the Pacific coast the Snowy Plover is found from California to 
northern Chili, “and there is no evidence that it is a migratory bird in any 
part of its range.” 1 
Aegialitis wilsonia (Orp). 
WItson’s PLOVER. 
Ochthodromus wilsonius Brwpine, Proc. U. S. Nat. Mus., V. 1888, 545 (Cape 
Region). 
Aegialitis wilsonta Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 275 (Cape 
Region). 
My Lower California specimens of Wilson’s Plover have considerably less 
white on the forehead and sides of the head than do the birds from the eastern 
United States. In the latter the forehead and superciliary stripes are pure 
white and the lores often whitish. In the former the lores are always dusky, 
the superciliary stripe is usually narrow and sometimes indistinct, and the 
white of the forehead often more or less mixed with gray. The upper parts 
are a shade darker, and in the female the pectoral band is somewhat broader 
and duskier. In some of these respects the Lower California birds resemble 
Mr. Ridgway’s well marked form rufinucha, or rather, to be more precise, 
they have even less white about the head than has that subspecies. In respect 
to the amount and depth of the rufous on the head and neck, however, they do 
not differ from typical wilsonza, to which, I think, they may best be referred.? 
Mr. Frazar found Wilson’s Plover ‘common at La Paz in February and at 
Carmen Island early in March.” His collection also includes two specimens 
from San José del Cabo, taken respectively on October 18 and 22. The former 
date is referred to in his notes as that of the “arrival” of the species. In 
another connection he characterizes it as a “ winter resident only.’? If it does 
not breed near Cape St. Lucas the question at once arises where the birds which 
occur there in winter come from, for none have been reported from any locality 
in the central or northern portions of the Peninsula. Mr. Seebohm says? that 
A. wilsonia breeds “ as far north as California,’ but no authority is given for 
this statement. Baird, Brewer, and Ridgway limit its northward range on the 
Pacific coast to Cape St. Lucas. Southward it occurs on the western shores of 
Mexico, Central America, and South America to the extreme northern part of 
Peru. Throughout this range it is said to breed wherever found. 
1 Seebohm, Geogr. Distr. Charadriidae, 1888, 172. 
2 Since writing the above I find that Mr. Ridgway has called attention to some 
of these peculiarities as illustrated by specimens from Mazatlan and Cape St. 
Lucas in the collection of the National Museum (Baird, Brewer, and Ridgway, 
Water Birds, N. Amer., I. 1884, 169). 
8 Geogr. Distr. Charadriidae, 1888, 155. 4 Loc. cit., 168. 
