143 



Aquila milvoides Snx, Av. Bras, i, 1324, pi. Id. 



Morphnus milvoides Cuv. Reg. An. i, 1829, 330. 



Haliaetns milvoides Gray, List. Acc. B. M. 1844, 12 ; Gen. i, 1845, 17. 

 Busard roux de Cayenne Maud. Enc. M6th. 1784, 543. 

 Black-necked Falcon Lath. Gen. Synop. Suppl. i, 1787, 30. 



LeBiisevai Levall. Ois. d'Afr. i, 1799,84, pi. 20.— Su^-'D. Grit, oni Levaill. 20 1^.53, 25. 

 Bnzzaret Lath. Gen. Syu. Suppl. ii, 1801, 32. 

 Cabeza llanca Azara, Pax. Par., i, 1802, 78. 



Hab. — Tropical America, south to Paraguay, north to Mazatlan, 

 Western Mexico. 



Wing, 15.00-17.50; tail, 7.30-8.50; 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, 

 l)rimaries, and terminal half of the tail black. Feathers of the upper 

 surface, includiug the pileum and nape, with shaft-streaks of black, 

 these widening into stripes on the scapulars. Basal half of the tail 

 usnall}^ 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 ; tiliife and crissum 

 barred with black. Upper parts thickly barred with black, which pre- 

 vails on the dorsal region. A dusky stripe from the eye across the au- 

 riculars. 



Mexican specimens are larger and lighter-colored than those from 

 South America. 



Lisi of specimens in United States Xational Museum, 



6 ■ 



"^ 



2 



o 



3 



o 



6 



a 

 'So 



O . 



c I 

 ■ _o = 



5 ^ 



m 



Locality. 



Date. 



From whom received. 



16528 







-ad. 



cf ad. 

 ? ad. 

 ?ad. 

 cf ad. 

 — ad. 



Brazil 





Capt. T. .J. Page. 



177S3 



78 

 78 







Truando, Xew Granada 





17784 



do 





Do 



32364 









5>762 



897 

 108 







,1868 



Aug. 28, 



Col. A. J. Grayson. 

 Captain Page'. 



59007 



Paraguay 







Oilier specimens examined. — In mus. Pliilad. Acad., 6 ; Am. Mas., N. Y., 2 ; Boston Soc, 

 4; total, 18. 



The sexes compare in m€asureraents as follows: — 



o 



Wiug. 



Tail. 



a 



"a 

 o 





6 

 o 



03 



P 



s 



'3 



o 



o 



? 



15. 00-15. 50 

 17.00 



7. 50-7. 80 

 8.50 



1.10 

 1.30 



3. 15-3. 20 

 3.30 



1. 80-1. 85 

 2.20 



2 



1 



BiognqjJiical notes. 



" No locality that I have ever visited in my researches for the objects 

 pertaining to ornithology equals that where the Mazatlan Eiver forms 

 an 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 



