4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



feathers ; lores and orbital area bare, a slight line below the eye, the 

 cheeks, and the auriculars like the crown ; the posterior auriculars 

 shading to bufify 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, often, but not always, 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 bill 

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



Immature: Similar to the adult, but with a brownish slate tinge 

 on the upperparts ; the pale tail bands washed with pale fulvous ; the 

 entire underparts with a buffy wash ; the feathers of the breast and 

 sides with prominent dusky shaft streaks ; bill blackish except basally 

 where it is yellow. 



Juvenal: Similar to adult, but upperparts dull fuscous with a 

 faint slate wash ; underparts whitish with a buffy wash on the throat, 

 breast, sides, flanks, and upper abdomen, but not on chin or vent ; 

 each feather of the throat, breast, sides, flanks, and upper abdomen 

 with a broad border of fulvous drab to hair brown, producing a con- 

 spicuously scalloped appearance ; bill yellow, slightly dusky along the 

 proximal portion of the culmen. 



Natal down : Unknown. 



Micrastur mirandollei extimiis: Adult : Like that of the nominate 

 race except for the color of the tail bands, as shown in the illustra- 

 tions and mentioned above. (No specimen from the range of ex- 

 timiis shows any approach to mirandollei, but one adult female of the 

 latter form, from Rio Jamunda, Brazil (Amer. Mus. Nat. Hist. 

 283244), and one from Cerro Duida, Venezuela (Amer. Mus. Nat. 

 Hist. 272322), show some resemblance to extimus in this respect. 

 However, 2 specimens out of 1 1 is not a serious exception to the gen- 

 eral picture, and of these 2, the Cerro Duida bird is less aberrant than 

 the one from Rio Jamunda.) 



Immature: Similar to that of typical mirandollei. 



Juvenal: Similar to that of the nominate race but with the broad 

 edges of the feathers of the throat, breast, sides, flanks, and upper 

 abdomen averaging darker — dark hair brown. 



Natal down : Unknown. 



Specimens examined. — M. m. mirandollei, 11 : Venezuela 2, Brazil 

 6, British Guiana i, French Guiana i, Bolivia i. M. m. extimus, 15 : 

 Costa Rica i, Panama 4, western Colombia 9, without locality i. 



