FALCONID^ — THE FALCONS. 305 



equal to fifth; second intermediate between fifth and sixth; first equal to eighth. Wing, 

 16.50; tail, 9.00; tarsus, 2.50; middle toe, 1.30; bill, 1.30 and .90. 



Adult female (28,156, Philadelphia, Pa.; J. Krider). Generally similar to the male. 

 On head and nape, however, the yellowish-white predominates, the central black being 

 much reduced ; on the other hand, there is less white on the upper parts, the dull cine- 

 reous-drab being much more evenly spread ; darker markings less conspicuous. Tail 

 white only at the base, the remaining portion being pale cinereous-drab crossed with 

 four or five distinct, very regular bands of black, the tip being very broadly ashy. 

 Flanks with ground-color light umber-drab, and marked with transverse bands of black. 

 Lower surface generally as in the male ; tail-coverts with two or three blackish spots, 

 apparently out of place. Fourth quill longest ; fifth much shorter than third ; second 

 intermediate between fifth and sixth; first intermediate between seventh and eighth. 

 Wing, 17.00; tail, 9.00; tarsus, 2.40; middle toe, 1.30; bill, 1.30 and .85. 



Young (25,934, United States). Upper surface generally light umber, becoming lighter 

 on scapulars and middle wing-coverts, but showing nowhere any trace of spots or bands ; 

 wings, scapulars, and back with blackish shaft-streaks; primaries approaching black toward 

 ends, becoming white basally ; upper tail-coverts white, with a hastate stripe of brown 

 along shaft ; tail, basal half white, terminal half plain drab, becoming darker terminally, 

 the tip narrowly white. Head, neck, and lower plumage in general, white stained with 

 ochraceous, this deepest on tibise and tarsi; head and neck streaked with dark brown, ear- 

 coverts almost immaculate ; breast with oblong spots of clear brown ; flanks, abdomen, 

 and anal region continuous uniform rich purplish vandyke-brown, forming conspicuous 

 transverse belt; tibiae and tarsi scarcely varied, the few markings longitudinal; lower tail- 

 coverts immaculate. Under side of wing much as in adult ; black area, however, more 

 extended ; lining much tinged with rufous, and with longitudinal streaks of dark brown. 



h. Melanistic condition. 



Adult male (28,153, Philadelphia; J. Krider). General plumage blackish-brown, the 

 head streaked by whitish edges of the feathers; wing-coverts, secondaries, primaries, 

 and tibial plumes paler terminally; tarsi mottled with whitish; upper and lower tail- 

 coverts tipped obscurely with white. Tail narrowly tipped with dull white, and with 

 about five very obsolete pale ashy bands. Lining of wing black, spotted with white near 

 edge; whole under surface of the primaries pure white anterior to their emargination, 

 beyond which they are black. Third and fourth quills equal and longest ; second inter- 

 mediate between fifth and sixth ; first shorter than seventh. Wing, 16.00 ; tail, 8.85 ; 

 tarsus, 2.45; middle toe, 1.25. 



Adult female (12,008, Philadelphia; C. Drexler). Continuous pure carbonaceous black; 

 forehead white ; occiput same beneath surface. Tail paler at tip, and crossed with four 

 ill-defined though continuous bands of ashy white, the last of which is distant over two 

 and a half inches from the tip ; lower tail-coverts with a few white spots. Whole lining 

 of wing glossy coal black ; under surface of primaries, anterior to their emargination, white 

 mottled with ashy. Fourth and fifth quills equal and longest; third only a little shorter; 

 second a little longer than sixth; first intermediate between seventh and eighth. Wing, 

 16.50 ; tail, 9.00 ; tarsus, 2.50 ; middle toe, 1.20. 



Young. Similar, but the tail dusky, growing whitish toward the base, and without any 

 bars. 



Hab. Whole of North America north of Mexico, but breeding northward of the United 

 States. 



Localities: Western Arizona (Coues, Pr. A. N. S., 1866, 48). 



LIST OF SPECIMENS EXAMINED. 



National Museum, 44 ; Philadelphia Academy, 17 ; Boston Society, 1 ; Museum Com- 

 voL. III. 39 



