Genus THRASAETUS, Gray. 
Harpia Vieili.OT, Analyse, 1816,24. Type, ialco harpyia Linn, (not of Oschenii. 1810). 
Harpyia Cuvier, 1817. Same type. 
I'hrasaetus Gray, P. Z. S. 1837,108. Same type. 
Nethrophrontes Gloger, Hanclb. Nature. 1842,219. Same type. 
Anopaia IIaldeman, Pr. Ac. Nat. Sci. Philad. 1842, 188. Same type. 
Cii.—F orm that of Spizaetus , but organization more robust through¬ 
out, ami tarsi almost entirely bare. Bill robust (similar to that of 
Spizaetus coronatus ); arch of the culmen forming about one-third the 
circumference of a circle, but the terminal curve rather abrupt, the tip 
inclining backward; upper tomium moderately lobed. Nostril oval, 
obliquely vertical, beveled oft anteriorly to the edge of the cere. Feet 
exceedingly robust and powerful; tarsus less than twice the length 
of the middle toe; lateral toes nearly equal, the outer not appreciably 
longer than the inner, and very conspicuously weaker; middle toe ex¬ 
ceeding the lateral toes by the length of its terminal phalanx; hind toe 
robust and powerful, nearly equal to the inner. Claws large, powerful, 
but rather obtuse, greatly graduated in size, the outer being scarcely 
more than one-third the inner in length ; inner and posterior claws equal 
to their digits. Web between outer and middle toes well developed. 
Scutelhe of tarsi and toes rough, and very irregular; they are generally 
of irregular hexagonal shape, and small, but they enlarge into trans¬ 
verse plates on the toes (except the basal phalanx), and on the front of the 
tarsus, where they form a short series of about ten broad scutellse; those 
of the posterior face are much larger, but very irregular both in size 
and arrangement, but they form a somewhat interrupted, and some¬ 
times double series, which twists to the outer side toward the lower por¬ 
tion. Plumage generally full, the feathers broad and soft, with gently 
convex tips. Lores scantily bristled ; tibiae clothed with close, com¬ 
pact, very short feathers, extending in front over the upper half of the 
tarsus. Feathers of the posterior portions of the head and neck greatly 
developed, the occipital plumes much elongated, forming a broad, 
depressed crest, erectile at pleasure, those of the sides and hinder part 
of the neck forming when erected a broad ruff. Wing very short; 
primaries not reaching beyond the secondaries. Fifth, sixth, or seventh 
primaries longest; first shortest; outer seven with their inner webs 
very shallowly sinuated, the sinuation being perceptible on the last. 
Tail very long, nearly equal to the wing, even, the feathers strong and 
broad. 
THRASAETUS HARPYIA. 
IIARPY EAGLE. 
fAquila cristcita Brisson, Orn. 1760, 446. 
Vultnr harpyia Linn. S. N. i, 1766, 446 (Adult.) , 
Falco harpyia Gm. S. N. i, 1788, 251. 
Gypaetus harpyia Daud. Tr. ii, 1800, 27. * 
Thrasaetus harpyia Gray, P. Z. S. 1837, 108: Gen. i, 1845, 15, Hand List, i, 1869. 16. 
— Bonap. Consp. i, 1850, 29.— Strickl. Orn. Syn. i, 1855, 26.— Lawr. Ann. Lye. 
N. Y. 1862, 7 (New Granada).— Scl. & S.u.v. P. Z S. 1864, 368 (Isth. Panama); 
Nom. Neotr. 1873, 120.— Sharpe, Cat. Acc. B. M. 1874, 224. 
Morphnus harpyia Cab. &Tschudi, Arch. f. Naturg. 1844, 96, 265 .—Pei.z. Orn. Bras. 
1871, 4, 397. 
Astur harpyia Schi.. Mus. P.-B., Astures, 1862,25. 
Morphnus ( Thrasaetus ) harpyia Ridgw. Proc. Boston Soc. Nat. Hist. 1-73, 72. 
Vultar coronatus Jacq. Beitr. 1784,15. 
Gypaetus coronatus Daud. Tr. ii, 1800,28. 
