264 



NORTH AMERICAN BIRDS. 



sharply defined against the surroumlinn; bhickish ; lores dusky. Whole breast, cinnamon- 

 rufous (forming a wide, sharply defined band), marked laterally with the brown of the 

 neck ; each feather with a shaft-line of black ; rest of lower parts, including whole lining 

 of the wing, continuous ochraceous white, the latter region unvariegated ; sides with 

 sparse, faint, transverse bars of rufous, and shaft-lines of darker. Under side of primaries 

 light slate anterior to emargination, beyond which they are black ;. slaty portion crossed 

 by very obscure bars of darker. Fourth quill longest, third scarcely shorter ; second equal 

 to fifth; first intermediate between seventh and eighth. Length, 19.75; extent, 48.00; 

 wing, 15.40 ; tail, 8.00 ; tarsus, 2.32 ; middle toe, l.GO. (Weight H lbs.) Bill slate-black, 

 bluish basally; cere, and angle of mouth, light dull lemon yellow; iris deep hazel; tarsi 

 and toes deep chrome yellow, claws black. 



58503, f 



Buteo swai7ismti (Nevada). 



Adult female (58,507, Great Salt Lake City, Utah, May; G. King, R. Ridgway). Sim- 

 ilar to the male, but pectoral area blackish-brown, hke the back; blackish-brown of upper 

 surface untinged with rufous, all the feathers, however, fading on edges ; bands of the tail 

 scarcely distinguishable on outer webs; white of forehead very restricted; Uning of the 

 wing barred with small cordate or deltoid spots of black ; under siirface of primaries 

 plain deep slate. Abdomen and sides variegated with a few irregular longitudinal spots, 

 and on the latter, transverse bars of dark brown ; tibise with faint bars of rufous. Fourth 

 quill longest; third scarcely shorter; second very sUghtly shorter than fifth; first inter- 

 mediate between seventh and eighth. Length, 21.50 ; extent, 54.00 ; wing, 16.50 ; tail, 

 8..50; tarsus, 2.70; middle toe, 1.70. (Weight, 2f lbs.) 



Young (10,7G1, Rocky Mountains, September; C. Drexler). Head, neck, and entire 

 lower parts fine delicate light ochraceous, or cream-color ; feathers of the crown, occiput, 

 and neck, each with a medial stripe of black, of less amount, however, than the ochra- 

 ceous ; forehead, supraoral region, and ear-coverts, with only a few very fine hair-like 

 shaft-streaks ; on the chin, and across the cheeks, are longitudinal spaces of blended 

 streaks of black, the latter forming a conspicuous " mustache " ; sides of the brea.?t with 

 large ovate spots of black ; middle of the breast with less numerous, smaller, and more 

 longitudinal ones of the same ; sides, flanks, and abdomen, with broad hastate spots, 

 more irregular and transverse on the former ; throat, tibije, anal region, and lower tail- 

 coverts immaculate. Upper surface generally, deep black; feathers bordered with pale 

 ochraceous, the scapulars and middle wing-coverts much variegated with the same. Sec- 

 ondary coverts, secondaries, and primaries narrowly tipped with white. Upper tail- 

 coverts pale ochraceous, barred with black. Tail ashy-brown, very much lighter than 

 the rump (more hoary than in the adult), narrowly, but clearly, tipped with white, and 

 crossed by ten or twelve narrow bands of black, more distinct than in the adult. Under 

 surface of primaries more whitish than in the adult. 



(b. Melanisiic condition ; = B. iiisignaius of Cassin,) 

 Adult male (22,567, Onion River ; R. McFarlane). Entirely brownish black, whole under 

 surface of wings included ; lower tail-coverts equally barred with white and black. Tail 



