BULLOCKS ORIOLE 279 



in the southern part of the state. This species has been noted in 

 small numbers along the San Joaquin River during August." 



The fall migration in Arizona is referred to by Swarth (1904) as 

 follows: "The only time at which I have seen Bullock Orioles at all 

 abundant in the Huachuca Mountains was in August 1902. About 

 the middle of the month flocks of from ten to twenty, nearly all 

 young birds, could be seen along the canyons up to an altitude of 

 about 5,500 feet. Most of these must have come in from other parts 

 of the country, for I have never found them breeding at all abundantly 

 in the mountains, being in fact, the rarest of the three species of orioles 

 occurring there." 



DISTRIBUTION 



Range. — Southwestern Canada to Costa Rica. 



Breeding range. — Bullock's oriole breeds from southern British 

 Columbia east of the coastal ranges (Milner, Alkali Lake, Okanagan 

 Landing), northwestern Montana (Flathead Lake) southern Alberta 

 (Warner, Medicine Hat), southwestern Saskatchewan (Maple Creek, 

 Eastend), northeastern Montana (Fan-view), southwestern North Da- 

 kota (Medora), western South Dakota (Harding County, Black Hills), 

 western Nebraska (Chadron, McCook), western Kansas (Garden City), 

 western Oklahoma (Gate), and central Texas (Vernon, Austin) ; south to 

 central and southern interior California (Mount Saint Helena, Twenty- 

 nine Palms), southern Nevada (Charleston Mountains, Pioche), south- 

 western Utah (Saint George), central and central-western Arizona 

 (Prescott, Tucson), northeastern Sonora (Saric, Pilares), probably 

 northern Chihuahua (Casas Grandes), central Coahuila (Monclava), 

 and southern Texas (Rio Grande City, Brownsville). Summer 

 records to east of this range: North Dakota (Towner), South Dakota 

 (Pierre), Kansas (Fort Riley, Manhattan, Lawrence). Hybridizes 

 extensively with /. galbula in western Oklahoma and western Nebraska. 



Winter range. — Winters from southern Sinaloa (Mazatlan), Mexico. 

 (Tlalpam), and Puebla south, west of the continental divide, to north- 

 western Costa Rica (Liberia); casually north to central California 

 (Durham, Dry town) and southern Texas (Nueces), and southern 

 Louisiana (Cameron, Baton Rouge). 



Casual records. — Casual in western Washington (Tacoma, 

 Vancouver). 



Accidental in New York (Onondaga County), Massachusetts 

 (Falmouth), Maine (Sorrento), and Georgia (Grady County). 



Migration. — The data deal with the species as a whole. 



Early dates of spring arrival are: Sonora — Tesia, March 19. 

 Texas — Rockport, March 20; Cameron County, April 4. Oklahoma — 



380928—57 19 



