62 FALCONID^. 



Hob. NoETH America generally ^o 25 42 _Mexico s, Cuihuichupa in Sonora {BoUnette ^% 

 Hermosillo {Ferrari-Perez), Guaymas {Belding^'^), Mazatlan {Graysorb^% Ciudad 

 in Durango (Forrer), Zacatecas, Bolanos, Zapotlan, Sierra Madre de Nayarit, 

 Volcan de Colima, Plains of Colima and San Luis Potosi (W. S. Richard son), 

 Hacienda de San Marcos, Jalisco [W. i%(Z), Guanajuato {I)ugbs^^^% Michoacan 

 (Sumichrast ^% Valley of Mexico (Herrera " ^7)^ Coapa, Tlalpam (Ferrari-Perez), 

 Vera Cruz, Jalapa {de Oca ^, Ferrari-Perez ^s), Orizaba {Sumichrast ^^ ^e, Ferrari- 

 Perez), Talea, Oaxaca {Boucard ^% Cacoprieto, Tehuantepec city (Sumichrast i^), 

 Meridain Yucatan (6'cAo#3^); British Honduras, Southern Pine Ridge (^^anc- 

 aneaux); Guatemala (Skinner »), Duenas, San Geronimo (0. S. & F. B. G. ^ ^i), San 

 Martin, Quezaltenango ( W. B. Richardson) ; Nicaragua, Volcan de Chinandega, 

 Matagalpa (W. B. Richardson), San Juan del Sur (Nutting '^^) ; Costa Rica 

 (v. Frantzius^^^^), San Jose (Van Patten ^\ Carmiol^% Los Tabacales (Zeledon^^), 

 Cartago, San Isidro, Santa Maria (JJnderpood), La Palma, Gulf of Nicoya 

 (Nutting^); Panama, Volcan de Chiriqui, Chitra,' Calobre {Arce^% Isthmus 

 of Panama (M-Leannan n).— Cuba 20 ; Jamaica ^ ; Porto Rico i* ; Haiti ^s ; 

 Bahamas 2" ; Patagonia 1*. 



In Central America several of the forms of Red-tailed Buzzards recognized as 

 subspecies by the American naturalists occur. 



After a careful examination of the large series of specimens in the British Museum 

 we have come to the conclusion that there are several rates of B. borealis, easily 

 recognizable in their breeding-quarters, but difficult to distinguish when crowded 

 together in their winter homes. The young birds of the various races are quite 

 indistinguishable : much study will be necessary before we can appreciate the 

 difference between the resident northern races and merely immigrant birds. 



The following races of Red-tailed Buzzards are generally admitted by the American 

 ornithologists : — 



Buteo borealis. This is the species of the Eastern and Central United States, and is 

 also the form which nests in Canada and the northern territories of British North 

 America. The specimens obtained during the Boundary Commission on the 49th 

 parallel apparently belong to this species, but as we have only young birds before 

 us, we have been unable with certainty to determine their identity. We notice 

 that the , Red-tailed Buzzard of Montana has recently been referred to B. calurus, 

 but we are inclined to consider the specimen in the British Museum from that State 

 to be true B. borealis. 



In Texas, whence we have received examples of at least three forms, we have 

 seen only four which we could assign to the true B. borealis. Prom Tarpon 

 Springs in Florida we have examined a single specimen also referable to this race, 

 which breeds in Jamaica and visits other West Indian islands on migration. We are 



