BIRDS OF NORTH AND MIDDLE AMERICA 573 



chaetura-black tipped with white or buffy white and crossed by three 

 narrow equally spaced, whitish or buffy white bands, each enclosing 

 a mottled transverse area of deep mouse gray; lores and orbital area 

 bare; a slight line below the eye, cheeks and auriculars like the crown; 

 the posterior auriculars shading to bufTy white; chin, throat, breast, 

 abdomen, sides, flanks, thighs, and under tail coverts whitish to pale 

 light pinkish buff, the feathers, especially of the breast and sides, with 

 very fine dusky shaft lines; under wing coverts whitish to pinkish 

 buff, the lower ones mixed or banded with deep neutral gray; iris 

 yellowish brown; cere and base of both mandibles yellowish, the bUl 

 otherwise horn-black; tarsi and toes bright yellow; claws black. 



Immature (sexes alike). — Similar to adult, but with a brownish slate 

 tinge on the upperparts, pale tail bands washed with pale fulvous, the 

 entire underparts pinkish buff to warm buff, the feathers of the breast 

 and sides with dusky shaft streaks; bill blackish except basally, where 

 it is j^ellow. 



Juvenal (sexes alike). — Similar to adult, but entire upperparts dull 

 fuscous with a faint slate wash; underparts white washed with pale 

 buff on the throat, breast, sides, flanks, and upper part of the abdomen, 

 not on chin or vent; each feather of the throat, breast, sides, flanlvs, 

 and upper abdomen with a broad border of fulvous drab to dark hair 

 brown, producing a conspicuously scalloped appearance; bill yellow, 

 slightly dusky along the proximal portion of the culmen. 



Natal down. — Unknown. 



Adult male.—^Ymg 216-237 (221.3); tail 182-200 (191.5), cuhnen 

 from cere 20-23.3 (21.0); tarsus 74.1-81 (77.6); middle toe without 

 claw 32.5-38 mm. (35.1 mm.).^^ 



Adult female.— Wmg 220-228 (224.3); tail 187-195 (191); cidmen 

 from cere 20.2-22.4 (21.4); middle toe without claw 35.1-38 

 (36.4 mm.). ''^ 



Range. — Resident, and apparently everywhere rather scarce, in 

 tropical forests from Costa Rica (Talamanca) to Panama (scattered 

 records from the Caribbean slope, only 1 record from the Pacific 

 slope — Panama Railway Line, Rio Chepo, Perme, Obaldia), and south 

 to western Colombia (Choc6; Rio Jurado, Rio Yarubida, Rio Baudo). 



Type locality. — Perme, Caribbean coast of extreme eastern Panama. 



[Micrastur] poliogasterl (not Falco poliogaster Temminck, 1824) Lawkence, Ann. 



Lye. Nat. Hist. New York, vii, 1862, 317 (Panama Railway; descr.; crit.). 

 Micrastur mirandolUi Ridgway, Proc. Acad. Nat. Sci. Philadelphia, 1875, 485, 



part (naonogr.; Talamanca, Costa Rica). — Salvin, Ibis, 1886, 501, part 



(Panama); Ibis, 1876, 3 part (diagnosis). 



'^ Seven specimens from Panama, Costa Rica, and Colombia. 



^^ Seven specimens from Panama and Colombia. A female from Rio Jurad6, 

 Colombia is said by Dugand (Caldasia, No. 3, Dec. 1941, p. 58) to have a wing of 

 235, tail 200 mm. 



