FALCONID^— FALCONING: FALCONS. 535 



forward to invade the breast (this is the rule in European birds, the exception, though not a 

 rare one, in American birds). Tail and its up])or coverts reguhirly and closely barred with 

 blackish and ashy-gray, the interspacing best marked on the inner webs, and all the feathers 

 narrowly tipped with white or whitish. Primaries all showing uniform blackish on their ex- 

 posed surfiices, but on the inner webs seen to be marked with numerous regular and close-set 

 spots of white, whitish, or muddy buff, for the most part isolated within the webs, but on the 



Fig 377. — Peregrine Falcon, or Duck Hawk, \ nat. size. (From Brehm.) 



inner primaries and secondaries, and toward the bases of all, becoming or tencUng to become bars 

 reaching the edge of the feather. Bill bbie-black; cere and much of base of bill yellow; 

 feet yellow ; claws blackish. Size very variable ; length of a good-sized 9 > 19-00 ; extent 

 45.00; wing 14.50 ; tail 7-00. $ averaging smaller; wing 12.50; tail 6.00; a usual range, 

 sex not considered, is, wing 11.50-14.00; tail 6.00-8.00; tarsus 1.75-2.10; middle toe 

 without claw rather more. Young : Recognizably similar to the adults in general characters ; 

 not barred below, but there nnore or less extensively and heavily streaked lengthwise ; upper 



