Carriker : List of the Birds of Costa Rica. 457 



Buteo fuliginosus Lawrence, Ann. Lye. N. Y., IX, 1868, 133 (La Palma [Zele- 

 don]). — Frantzius, Jour, fiir Orn., 1869, 368 (San Antonio [Zeled6n]). 

 Tachytriorchis abbreviahis Sharpe, Cat. Birds Brit. Mus., I, 1874, 163. 



A rare migrant, a few birds remaining scattered over the highlands, 

 while the balance of the few that go further south than Mexico, drift 

 on to Panama and South America. 



138. Buteo swainsoni Bonaparte. 



Buteo swainsoni Bonaparte, Geog. & Comp. List, 1838, 3. — Zeledon, An. 

 Mus. Nac. de C. R., I, 1887, 126. — Cherrie, Auk, VII, 1890, 333; IX, 

 1892, 328 (seen occasionally from Nov. 1 to Feb. 25). — Salvin and Godman, 

 Biol. Centr.-Am., Aves, III, 1901, 68 (Tucurriqui [Arce]). 



Buteo obsoletus Sharpe, Cat. Birds Brit. Mus., I, 1874, 184. 



Buteo albonotatus Lawrence, Ann. Lye. N. Y., IX, 1868, 133 (San Jose [J. 

 Carmiol] ). 



Carnegie Museum : Volcan de Irazu (8000 ft.), $ & J 1 , Apr. 4 and 



16, 1902 (Carriker). 



I never met with this species except during April, 1902, on the 

 Volcan de Irazu, where they were quite numerous for about three 

 weeks and then disappeared. I believe that they were migrating from 

 some point further south and stopped on Irazu to rest and feed. 

 During the early autumn of 1906 there passed over El Hogar at a 

 great height, an enormous flock of hawks, which I think were of this 

 species, but they were too high to be certain of the identification. 

 As nearly as I could estimate, there appeared to be at least a thousand 

 of them. They came from the northwest, moving slowly in great 

 circles, and after perhaps half an hour disappeared toward the south- 

 east. 



139. Buteo borealis costaricensis Ridgway. 



Buteo borealis, var. costaricensis Ridgway, Baird, Brewer, and Ridgway, Hist. N. 



Amer. Birds, III, 1874, 2 ^5 (Costa Rica [Frantzius] ). 

 Buteo borealis costaricensis Nutting, Proc. U. S. Nat. Mus., V, 1882, 404 (La 



Palma de Nicoya). — Zeledon, An. Mus. Nac. de C. R., I, 1887, 126 (Car- 



tago and Santa Maria de Dota). 

 Buteo borealis, var. montanus Lawrence, Ann. Lye. N. Y., IX, 1868, 133 (San 



Jose [J. Carmiol], Los Tabacales [Zeledon]). — Frantzius, Jour, fiir Orn., 



1869, 368 (C. R.). 

 Buteo borealis Salvin and Godman, Biol. Centr.-Am., Aves, III, 1901, 61 



(Cartago, San Isidro, Dota). 

 Buteo montanus {nee Nutt. ) CABANis, Jour, fiir Orn., 1869,210(0. R.). — 



Sharpe, Cat. Birds Brit. Mus., I, 1874, 189 (San Jose [Van Patten]). 



