BIRDS OF NORTH AND MIDDLE AMERICA 



449 



fuscous-black; breast, especially laterally, deep biiffy brown with 

 broad blackish shaft streaks, the feathers, especially those toward the 

 middle of the breast, edged and tipped with white; lower breast, 

 entire abdomen, sides, flanks, thighs, and under tail coverts dark 



Figure 33. — Spizaetus {"Ptermira") tyrannus. 



fuscous to fuscous-black barred with white, the bars on the lower 

 breast and upper abdomen broken into separate spots on the two webs 

 of the feathers; under wing coverts with much more white than in 

 adults. 



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



