702 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Falco temerarius Audubon, Orn. Biogr., i, 1831, 381, pi. 75 (near Flatland Ford, 



Pa.); V, 1839, 368; Birds Amer., fol. ed., pis. 75, 92.— Nuttall, Man. Orn. 



United States and Canada, Land Birds, 1832, 61. 

 Falco auduboni Blackwbll, Res. Zool., 1834, 193, ed. 2, 1873, 178 (spec, sent from 



Philadelphia). 

 Falco columbarius richardsoni Grey, Condor, xxvii, 1925, 37, text (San Diego, 



Calif.). 



FALCO COLUMBARIUS BENDIREI Swann 



Western Pigeon Hawk 



Adult male. — Intermediate between that of Falco columbarius colum- 

 barius and Falco columbarius richardsonii; crown, occiput, inter- 

 scapidars, scapulars, and upper wing coverts deep neutral gray to slate, 

 paling on the lower back, rump, upper tail coverts, and inner second- 

 aries to neutral gray and to light neutral gray, and each feather with a 

 black shaft stripe; rectrices as in the nominate race, but the three nar- 

 row black bands (anterior to the broad subterminal one) usually nar- 

 rower than, or equal to the pale gray interspaces in width, whereas in 

 columbarius they are usually wider than the gvSij interspaces; under- 

 parts as in columbarius, but the streaks averaging paler, sepia, not 

 fuscous; soft parts as in columbarius. 



Adult female. — Intermediate between that of Falco columbarius 

 columbarius and Falco columbarius richardsonii, but with more and 

 paler chaetura drab, less slate; below generally more whitish than 

 columbarius, the dark streaks paler, sepia with blackish shaft lines; 

 thighs more ochraceous buff. 



Juvenal (sexes alike). — Practically indistinguishable from that of 

 Falco columbarius columbarius averaging (in series) very slightly paler 

 and usually with the nuchal collar more heavily washed with ochra- 

 ceous buff. 



Natal down. — As in the nominate race. 



Adult male.—Wing 177-198 (190.9); tail 118-130 (124.5); culmen 

 from cere 11.5-13 (12.2); tarsus 35-40 (38.7); middle toe without claw 

 29-31 (30.1 mm.)." 



Adult female.— Wing 207-215 (210); tail 135-146 (140.7); culmen 

 from core 14-15 (14.4); tarsus 39-45 (41.4); middle toe without claw 

 32-35 (31 mm.).«2 



Range. — Breeds from northwestern Alaska (Savage, Nulato, Circle, 

 Keowak River, St. Michael, Demarcation Point, Taku Eiver, Kuiu 

 Island, Thomas Bay, McKinley Park, Yukon River, Cook Inlet, 

 Kodiak Island, Lake Alekmagik, Eagle, Chelitna River, Juneau, Lake 



" 25 specimens from Alaska, Northwest Territories, Mackenzie, Oregon, 

 Wyoming, California, New Mexico, Arizona, northern Mexico (Mazatldn and 

 Tamaulipas), Florida, Bahamas, Nicaragua, and Swan Island. 



"2 16 specimens from Alaska, Mackenzie, Alberta, Oregon, Idaho, California, 

 Texas, New Mexico, and Lower California. 



