2D Sennett on Undescribed Plumages of N. Am. Birds. [January 



the bird's bill, while the barbs extend backward over each eye, with the 

 shank losing itself down in the nape of the neck. This peculiar form is 

 made distinct not only because the down forming the spear-head is twice 

 as long as the rest of the head-growth, but while the short down of the 

 head is of a dark grayish color, the long down of the spear-head has its 

 edges sharply defined in black shading to a fulvous toward the centre. 

 Bill dark horn color. When the bird is half grown and the quills are just 

 appearing, the down on the head has about disappeared, leaving the 

 whole head black and nearly bare, the very minute and scattered growth 

 of feathers being scarcely noticeable. The down on the body is still as 

 dense as ever and very long. The color of the whole anterior half of the 

 bird has become redder and richer, while the posterior half has become 

 darker. The bill is black throughout. The down is now more than an 

 inch in length, and the bird presents a grotesque appearance, very much 

 as if it had covered its nakedness with a miniature faded buffalo skin over 

 coat. 



Parabuteo unicinctus harrisi. Harris's Hawk. 



Downy Stage: — All the upper parts uniform light tawny; underparts 

 and lores white with a tawny tinge on jugulum. Bill light brown horn 

 color above and yellowish white below. Just before the feathers appear 

 the down loses most of its tawny color above and the young bird looks 

 much whiter. 



First P/umage : — The crown, remiges, long scapulars, and zone of tail 

 deep rich blackish brown with purplish reflections; all the feathers of 

 crown, back, and rump tipped and edged lightly with chestnut. Feathers 

 over eye so broadly edged with light chestnut as to form a superciliary 

 line. Wing-coverts with more extensive and darker chestnut than in 

 adult. Upper and lower tail-coverts and terminal tail-band white tinged 

 with tawny. Throat streaked with black and tawny. Feathers of breast 

 black and tawny, and those of belly black and white. Tibia dark chest- 

 nut with narrow bands of fulvous. Feet yellow; claws black; bill dark 

 horn color. 



Buteo albicaudatus. White-tailed Hawk. 



I have in my collection six nestlings, taken in Texas, which are very 

 interesting and peculiar. Two of them are two days old, two four days 

 old, one about a week old, and the sixth about half grown, with its quills 

 and first feathers just started. 



Downy Stage : — Well covered with cottony down, most dense on head 

 and wings, and thinnest on throat and belly. The color underneath is 

 richer on upper back and wings, shading into brown on back of neck. 

 Whole top of head thickly covered with soft hair-like feathers from half 

 an inch to three-quarters of an inch in length, bristling up individually 

 and showing, when looked at from above, the pale tawny color of their 



