143 
Aquila milvoides Srix, Av. Bras, i, 1324, pi. Id. 
Morphnu8 milvoides Cuv. Reg. An. i, 1329, 330. 
Haliaetus milvoides Gray, List.Acc. B. M. 1844,12; Gen. i, 1845, 17. 
Busard roux de Cayenne Maud. Enc. Moth. 1784, 543. 
Black-necked Falcon Lath. Gen. Synop. Suppl. i, 1787, 30. 
Le Busevai Lev-all. Ois. d’Afr. i, 1799,84, pi. 20— Suxd. Grit, om Levaill. 20 U58, 2o. 
Buzzaret Lath. Gen. Syu. Suppl. ii, 1801, 32. 
C abeza blanca Azara, Pax. Par., i, 1802, 78. 
Hal ).—Tropical America, south to Paraguay, north to Mazatlan, 
Western Mexico. 
Wing, 15.00-17.50; tail, 7.30-S.50; culmen, 1.10-1.30; tarsus, 3.00- 
3.50; middle toe, 1.75-2.20. Adult .-—General color deep rufous, be¬ 
coming white on the head; a transverse jugular patch, secondaries, 
primaries, and terminal half of the tail black. Feathers ot the upper 
surface, including the pileuru and nape, with shaft-streaks of black, 
these widening into stripes on the scapulars. Basal half of the tail 
usually more or less barred with black (especially on the inner webs), 
and the tip sometimes narrowly rufous. Young: —Head, neck, tail, and 
primaries as in the adult. Whole breast blackish ; tibiie and crissum 
barred with black. Upper parts thickly barred with black, which pre¬ 
vails on the dorsal region. A dusky stripe from the ej'e across the au- 
riculars. 
Mexican specimens are larger and lighter-colored than t^ose from 
South America. 
List of specimens in United States National Museum. 
£ 
<v 
6 
6 
1 
’3d 
Condition of 
specimen. 
6 
tc 
X 
V 
Locality. 
Date. 
From whom received. 
16528 
17763 
17764 
32964 
52762 
59007 
— art. 
d ad. 
2 art. 
2 art. 
cf art. 
— art. 
Capt. T. J. Page. 
Arthur Schott. 
Do. 
Verreaux. 
Col. A. J. Grayson. 
Captain Page. 
78 
78 
Truando. New Granada. 
do .. 
Amazonia. 
897 
108 
. 
Mazatlan, Mexico. 
Paraguay. 
-,1868 
Aug. 28, - 
Other specimens examined. —In runs. Philad. Acacl., 6 ; Am. Mus., N. Y., 2 ; Boston Soc., 
4; total, 18. 
The sexes compare in measurements as follows:— 
6 
o 
. • 
P 
o 
77 
© 
tt 
p 
CO 
t- 
H3 
S 
■n 
£ 
H 
6 
ci 
H 
a 
15. 00-15. 50 
7. 50-7. 80 
1.10 
3.15-3. 2(1 
1. 80-1. 85 
9 
17. 00 
8. 50 
1.30 
3. 30 
2. 20 
Biographical notes. • 
“ No locality that I have ever visited in my researches for the objects 
pertaining to"ornithology equals that where the Mazatlan River forms 
au expansive valley near the sea-coast, for the great numbers and 
varieties of hawks there met with. They seem to assemble in this 
favorite spot from far and near, and almost all the known species are 
