BIRDS OF NORTH AND MIDDLE AMERICA 



593 



bands (not more than 10 mm. in width) anterior to the subterminal 

 area; these bands paHng along their transverse middles to grayish 

 hair brown, forming "shadow bars" on the median pair of feathers; 

 solid and increasingly broad on the outer webs of the more lateral 

 ones, narrower on the inner webs; the outer webs of the outermost 

 pair or two solidly and broadly margined with dark fuscous, due to 

 the fusion of the bars; iris clay color to dark mummy brown; bare 

 orbital skin deep chrome to lemon yellow; cere orange to lemon yellow; 

 base of bill surphur yellow; rest of bill very pale blue to pea green 

 becoming 'dusky olive-slate toward the yellow base. 



Figure 43. — Milvago chimachima. 



Juvenal (sexes alike). — Feathers of forehead and superciliary edge 

 of crown warm buff with dusky bases; those of crown, occiput, and 

 nape dark mummy brown to dark fuscous with terminal diamond- 

 shaped warm buff spots, the long axes of which are formed by the 

 shafts of the feathers, those of the nape longer, less angular (less 

 diamond shaped) ; upper wing coverts, scapulars, interscapulars, back, 

 rump, and remiges as in adult, but more rufescent, bister to warm 

 sepia, darkening to dark mummy brown on the remiges, and all the 

 light areas (tips, basal areas of remiges, etc.) more or less washed with 

 pinkish cinnamon (in worn specimens this is not very noticeable); 

 upper tail coverts and rectrices as in adult, but deeper, more cinna- 

 mon-buff, the dark bars on the rectrices browner, more dark bister, 

 the paler portions of the "shadow bars" on the median pair of tail 

 feathers tawny-olive, instead of grayish hair brown as in adults; 



