146 BULLETIN 16 7, UNITED STATES NATIONAL MUSEUM 



and some in the cottonwood trees directly over his head,^ and others 

 were hopping around on the bare ground." 



DISTRIBUTION 



Range. — Southwestern United States, and Central and South 

 America; not regularly migratory. 



The range of Harris's hawk extends north to southwestern Cali- 

 fornia (San Diego, Brawley, and Palo Verde) ; Arizona (Yuma, 

 Pecks Lake, Tombstone, and the San Bernardino Ranch) ; southern 

 New Mexico (Carlsbad) ; and southern Texas (Eagle Pass, San An- 

 tonio, and Giddings). East to Texas (Giddings, Lavaca County, 

 Refugio County, Corpus Christi, and Brownsville) ; Tamaulipas 

 (Matamoros) ; Puebla (Tehuacan) ; Venezuela (Zulia, Margarita 

 Island, Cariaco Peninsula, and Angostura) ; Brazil (Villa Bella, 

 Chapada, Bahia, Cantagallo, and Rio de Janeiro) ; and eastern Ar- 

 gentina (Corrientes, Buenos Aires, Canuelas, La Plata, Cape San 

 Antonio, Santa Elena, and Santa Cruz). South to southern Argen- 

 tina (Santa Cruz and Chubut) ; and southern Chile (Chiloe). West 

 to Chile (Chiloe, Valdivia, Santiago, and Valparaiso) ; northwestern 

 Argentina (Concepcion,Tucuman, Oran, and Salta) ; Bolivia (Caiza, 

 Crevaux, and Santa Cruz) ; Peru (lea, Lima, Trujillo, and Eten) ; 

 Ecuador (Puna Island, Guayaquil, Babahoyo, Chone, and Esineral- 

 das) ; Colombia (Bogota) ; Panama (Santa Fe) ; Costa Rica (San 

 Jose); Oaxaca (Tehuantepec and Oaxaca) ; Colima; Jalisco; Na- 

 yarit; Sinaloa (Escuinapa, Rosario, and Mazatlan) ; Lower Cali- 

 fornia (Cape San Lucas, Miraflores, San Gregorio, San Juan, San 

 Quenyn, and La Ensenada) ; and southwestern California (San 

 Diego). 



The range above outlined is for the species, which has, however, 

 been separated into two races. The form occurring in the southwest- 

 ern United States {harrisi) extends south through Central America to 

 western Ecuador, while the typical race {unicinctus) occupies the 

 South American range east of the Andes and probably also central 

 and northern Chile. 



Migration. — Harris's hawk is not migratory in the usual sense, 

 but it is probable that, depending more or less upon climatic condi- 

 tions, the individuals breeding in the United States withdraw into 

 Mexico during the winter season. On at least two occasions large 

 flights of these birds have been observed in southwestern California. 

 One of these flights, estimated to contain between 400 and 500 birds, 

 was observed on October 22, 1920, in the region between Heber and 

 Calexico, Calif. The second flight, estimated at 250 individuals, 

 was seen in the same region on August 28, 1923 (Chambers, 1921 and 

 1924). 



