792 



BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



tvrannus, Pternura, 452. 



Spizaetus, 442, 443, 447, 448, 45 L 



Spizaetus (Pternura), 449. 

 udsonius. Circus, 513. 

 uliffinosus, Circus, 504. 



Circus (Strigiceps), 504, 



Falco, 504. 



Strigiceps, 504. 

 ultratinnunculus, Falco tinnunculus, 



722. 

 umbrinus, Buteo borealis, 261. 



Buteo jamaicensis, 222, 223, 260, 

 261. 

 uncinata, Erythrocnema, 110, 374, 375. 

 uncinatus, Chondrohierax, 103, 107, 110, 

 111. 



Chondrohierax uncinatus, 102, lOS, 

 109-111. 



Cvmondis, 106, 110. 



Falco, 100, 106, 113. 



Leptodon, 107, 110. 



Pernis, 107. 



Pernis (Regerhinus), 107. 



Regerhinus, 107, 110, 111, 113. 



Regerhinus uncinatus, 107, 108. 



Rostrhamus, 107. 

 uncinnatus, Cymindis, 106, 113. 

 unicinatus, Cymindus, 107. 



Leptodon, 107. 

 unicincta, Asturina, 374. 



Falco, 368. 



Urubitinga, 374. 

 unicinctus, Astur, 370, 404. 



Buteo, 374. 



Craxirex, 374, 375. 



Falco, 368, 370, 374, 404. 



Morphnus, 370, 374, 375. 



Parabuteo, 370, 371, 374, 375. 



Parabuteo unicinctus, 370. 



Spizigeranus, 374. 



Urubitinga, 374. 

 uralensis, Falco rusticolus, 617, 638, 

 646-648. 



Hierofalco, 648. 

 Uraspiza, 142. 

 Uribitinga anthracina, 404. 

 Uroaetus, 63. 

 Urobitinga, 388. 



anthracina, 402. 

 Urospiza, 142. 

 Urospizia, 142. 

 Urospizias, 63, 142. 

 Urotriorchis, 63, 140. 

 urubitinga, Aquila, 394. 



Asturina, 395. 



Asturina (Spizigeranus), 395. 



Buteo, 395. 



Cathartes, 33, 36. 



Falco, 388, 392, 394, 408. 



Harpyia, 394. 



Hypomorphnus, 389, 394. 



Hvpomorphnus urubitinga, 390, 

 393, 394. 



Morphnus, 392, 394, 408. 



Morphnus urubitinga, 394. 



Oenops, 33. 



urubitinga, Rhinogrvphus, 33. 



Urubitinga, 393, 395. 



Urubitinca urubitinga, 395. 



Urubutinga, 395. 

 Urubitinga, 63, 204, 377, 388, 396. 



Brazilian, 393. 



Mexican, 390. 

 Urubitinga anthracina, 278, 280, 396, 

 401, 404, 406, 409. 



anthracina anthracina, 306, 402, 404. 



anthracina bangsi, 406. 



anthracina cancrivora, 404. 



anthracina gundlachii, 408. 



anthracina subtilis, 406. 



brasiliensis, 396, 408. 



ghiesbrechti, 383. 



ghiesbreghti, 381, 383. 



gundlachi, 408. 



gundlachii, 408. 



longipes, 396. 



meridionalis, 205, 208. 



(Spizigeranus) meridionalis, 208. 



mexicana, 403, 404. 



nigricollis, 413. 



plumbea, 386. 



princeps, 388. 



ridgwayi, 392. 



semi plumbea, 385. 



subtilis, 406. 



unicincta, 374. 



unicinctus, 374. 



urubitinga, 393, 395. 



urubitinga ridgwayi, 393. 



urubitinga subtilis, 406. 



urubitinga urubitinga, 395. 



zonura, 392, 395. 



zonura ridgwayi, 393. 



zonura zonura, 396. 

 Urubitingua, 388. 

 Urubitornis, 66, 67, 415. 



solitaria, 417, 418, 420. 



solitaria sheffleri, 417, 420, 421. 



solitaria solitaria, 417. 



solitarius, 420. 

 urubu, Catharista, 26. 



Catharista atrata, 28. 



Catharista urubu, 28. 



Catharistes, 28. 



Catharistes urubu, 28. 



Chathartes, 27. 



Coragyps, 8, 28. 



Coragyps urubu, 28. 



Percnopterus, 27. 



Vultur, 18, 26. 

 urubutinga, Catharista, 32. 



Cathartes, 32. 

 Urubutinga, 388. 



urubitinga, 395. 

 Urutitinga, 388. 

 ussuriensis, Falco peregrinus, 666. 



vagans, Ictinia plumbea, 129. 

 variatus, Nisus, 166. 

 variegatus. Circus, 504. 



Falco, 310, 504. 



Spizaetus, 427. 



