213 The Wilson Bulletin — No. 69. 



Nest. 



Mostly in trees, principally in pines, about six meters above 

 ground, sometimes on high cliffs ; nest composed of sticks, 

 shallow, lined with grass, moss, weed stalks, and the like. 



Eggs. 



Two to five, laid from the end of May to the end of June. 

 Shell closely grained. Vary greatly in size, shape, and color. 

 Color grenish or soiled white, with streaks, spots, and blotches 

 of -reddish brown and chocolate, in all styles of markings, regu- 

 lar and irregular, sparingly or heavily, though apparently 

 never unmarked. Similar to eggs of Bntco hutco or B. line- 

 atus. 55.4 by 44.6. One brood only. Incubation 27 days. 



ARCHIBUTEO FERRUGINEUS (Licht). 

 Ferruginous Rough-leg. 



Geographical Distribution. 

 Breeds from Kansas, northwestern Texas, and California 

 north to southern Manitoba, southwestern Saskatchewan, and 

 southern Washington ; winters south to northern Mexico, and 

 has occurred casually east to Wisconsin and Illinois. (Cooke). 

 Measurements. 

 Male : length 57.2, wing 40.4 to 42.7, tail 24.2 to 26.5, tar- 

 sus 6.99. 



Female : length 63.5, wing 42.7 to 47.7, tail 26.5 to 28. 



Diagnostic Marks. 

 In general like the Rough-leg, but plumage lighter and with 

 strong suffusion of rusty, tail much lighter, but with the same 

 pattern. 



Plumage. 

 General pattern like that of the Rou.gh-leg, but with reddish 

 prevailing over white or black in any of the phases of plum- 

 age. 



Flight and Habits. 

 General habit not much differing from that of the Rough- 

 leg. Soaring or flapping lazily, flying low while feeding, hov- 

 ering over prey, but shows no partiality for the vicinity of 



