BIRDS OF NORTH AND MIDDLE AMERICA 631 



ing; descr. nest).— Ridgwat, Araer. Nat., vi, 1S72, 430, in text (Wabash 

 and Lawrence Counties, 111., Aug. and Sept. 1871); Bull. Essex Inst., yii, 

 1875, 10, in text (Eagle Valley, Nev.).— Henshaw, Ann. Lye. Nat. Hist. 

 New York, xi, 1874, 9 (Utah)— Bendire, Proc. Boston Soc. Nat, Hist., xix, 



1877, 133 (Camp Harney, Oreg.; not rare; spec.). 



Gennaia pohjagrus Henry, Proc. Acad. Nat. Sci. Philadelphia, xi, 1857, 104 (New 



Mexico). 

 Falco (Hierofalco) lanarius b. var. pohjagrus Ridgwat, Proc. Boston Soc. Nat. 



Hist., xvi, 1873, 44. 

 Falco lanarius polyagrus Ridgway, Bull. Essex Inst., v, 1873, 173 (Wasatch 



Mountains, Utah, 4,000-9,000 feet), 186 (Colorado; rocky canyons); in 



Baird, Brewer, and Ridgway, Hist. North Amer. Birds, iii, 1874, 123; Ann. 



Lye. Nat. Hist. New York, x, 1874, 379 (Illinois).— Nelson, Bull. Essex 



Inst., viii, 1876, 151 (ne. Illinois: Wabash and Lawrence Counties).- Goobe, 



U. S. Nat. Mus. Bull. 20, 1883, 320. 

 Falco laniarius pohjagrus Grinnell, in Ludlow's Rep. Recon., 1876, 82 (Cone 



Butte, Camp Baker, etc., Montana). 

 Falco mexicanus var. polyagrus b. polyagrus Coues, Birds Northwest, 1874, 339. 

 Falco mexicanus pohjagrus Coues, U. S. Geol. and Geog. Surv. Terr., Bull. 4, 



1878, 021 (Two Forks Milk River, Mont.; habits).— Mearns, Bull. Nuttall 

 Orn. Club, iv, 1879, 196 (Fort Klamath, Greg.).— Nehrling, Bull. Nuttall 

 Orn. Club, vii, 1882, 173 (se. Texas, res.). 



Falco mexicanus, polyagrus Belding and Ridgwat, Proc. U. S. Nat. Mus., i, 



1879, 434 (Marysville, Stockton, and Summit Meadows, Calif.). 

 Hierofalco mexicanus polyagrus Ridgwat, Proc. U. S. Nat. Mus., iii, 1880, 192; 



Nom. North Amer. Birds, 1881, No. 413; Bull. Illinois Lab. Nat. Hist., No. 4, 



1881, 188 (Illinois). 

 Falco saker polyagrus Henshaw, Rep. Orn. Spec. Wheeler's Exped., 1874, 67, 137 



(Camp Bowie, Ariz.).— Ridgwat, Bull. Essex Inst., vii, 1875, 10, 13 (w. 



Nevada), 21 (Ruby Mountains, Nev.), 31 (Salt Lake Valley. Utah), 34 



(Parleys Peak, Utah), 38 (Nevada). 

 Falco saker, y polyagrus Ridgwat, Field and Forest, ii, 1877, 210 (Colorado). 

 Falco saker, & polyagrus Ridgwat, Orn. 40th Parallel, 1877, 577 (Humboldt 



Marshes, Carson, etc., Nev.). 

 Falco sublanarius Pelzeln, Ueb. Geier und Falk., ii, 1863, 19 (ex Natterer MS.). 



Subgenus Hierofalco Cuvier 



Very large falcons (largest members of the family, wing about 

 340-420 mm.) with more than upper half of tarsus densely feathered 

 anteriorly and laterally, the remaining portion covered with small 

 roundish scales, outer toe (without claw) extending to beyond penulti- 

 mate articulation of middle toe and very little if any beyond end of 

 inner toe, and with inner web of second primary (from outside) more 

 or less distinctly emarginated near tip. 



Bill relatively large and stout, its depth at base of rhamphotheca a 

 little greater than its width at same point and very nearly equal to 

 distance from anterior margin of cere (in front of nostril) to tip of 

 maxilla; maxilla swollen laterally and abruptly contracted in width 

 from in front of tomial "teeth"; culmen (chord) nearly half as long as 

 middle toe (without claw), broadly rounded (not ridged); width be- 



