BIRDS OF NORTH AND MIDDLE AMERICA 391 



than ninth; upper tail coverts white; rectrices whitish basally and at 

 tip and with two wide black bands crossing thern, otherwise white; 

 iris dark brov/n; cere, lores, tarsi, and feet orange-yellow; bill black, 

 bluish basally; claws black; skin of bristled preocular space slate. 



Immature (sexes alike). — ^Entire head, nape, chin, and throat warm 

 buff to capuchin buff, the top of the head and the nape and sides of 

 the neck heavily streaked with tear-shaped black shaft streaks, the 

 cheeks finely streaked with dark neutral gray; interscapulars and upper 

 back and upper wing coverts fuscous-black to chaetura black, the 

 upper wing coverts broadly edged and tipped (and scalloped) with 

 ochraceous-tawny to pinkish cinnamon; the secondaries, dark hair 

 brown banded with chaetura drab, the hair brown paling to pinkish 

 buff and even to whitish basally and on the inner webs; primaries 

 averaging more grayish, less brownish, than the secondaries, broadly 

 tipped with chaetura black; the inner webs basally whitish barred 

 with chaetura black; lower back and rump fuscous-black to chaetura 

 black irregidarly but abundantly barred with whitish; upper tail 

 coverts similar but with very broad white tips; rectrices whitish with 

 a very broad sub terminal black band (40 mm. or more in width) and 

 with four or five narrower black somewhat irregular bands; the whitish 

 interspaces finly mottled with mouse gray; breast, abdomen, thighs, 

 and under tail coverts warm buff to capuchin buff, the thighs and 

 under tail coverts barred with black, the breast and abdomen heavily 

 streaked with terminally greatly widening chaetura black shaft 

 streaks; under wing coverts warm buff to capuchin buff streaked more 

 or less with chaetura black. 



Juvenal (sexes alike). — Similar to the immature plumage, but with 

 the interscapulars and upper back more brownish, less blackish 

 fuscous, and the rectrices hair brown to deep mouse gray, basally 

 whitish, and crossed by 10-14 narrow chaetura black bands, the bands 

 slightly margined on their distal sides with wliitish; the sub terminal 

 band rather indistinct and slightly paler chaetura drab (less than 30 

 mm. in width) ; the tail feathers narrowly tipped with whitish. 



Natal down. — Not known. 



Adult ma/e.— Wings 367-403 (376.4); tail 226-274 (243.3); culmen 

 from cere 26-31 (28.8); tarsus 112-126 (116.4); middle toe without 

 claw 44.5-49 (47.2 mm.).'^ 



Adult female. —Wmgs 363-417 (388.8); tail 237-270 (248.5); cuhnen 

 from cere 29-32 (30.3); tarsus 108-127 (116.4); middle toe without 

 claw 45-50 (48.3 mm.).^^ 



Range. — Tropical zone from southern Tamaulipas (Altamira) and 

 Sonora (Alamos) south through Sinaloa (Mazatldn, Escuinapa, etc.), 



" Eleven specimens from Mexico, British Honduras, Costa Rica, and Panama. 

 " Seven specimens from Mexico, Honduras, and Costa Rica. 



