166 
Genus SPIZIASTUR, Lesson. 
“Spizastur Less. ”, Guay, List Gen. Subgen. 1843,3. Type, ialco atricapillus Temm. 
S. melanoleucus (Yieile). Spiziaslur Kaup, 1851.— Sharpe, Cat. Acc. Brit. Mus.. 
1874, 258. 
Cii.—S imilar to Spizaetus , but primaries longer, bill more compressed, 
toes and claws much longer, and head without an occipital crest. Bill 
much compressed, the tomia without distinct sinuations ; anterior out¬ 
line of the cere simply convex. Nostril oval, vertical, near the middle 
of the cere. Tarsus about one and a half times the length of the mid¬ 
dle toe ; lateral toes nearly equal, but the outer perceptibly the longer, 
reaching to about the middle of the subterminal phalanx of the middle- 
toe ; posterior toe longer than the outer. Claws excessively graduated, 
the first and second being extremely long, exceeding their digits, the 
outer small, less than two-thirds its digit, the third being intermediate 
in length; their form normal. A distinct web between outer and mid¬ 
dle toes. Tarsi densely feathered all round, only the lower joint 
exposed. Lores densely clothed with short, stiff bristles. Primaries 
exceeding the secondaries by about one-fourth the length of the wing; 
third, fourth, fifth, and sixth quills nearly equal, and longest, but the 
fourth and fifth usually exceeding the others; first shortest; inner webs 
of the outer five distinctly emarginated, the sixth faintly sinuated ; sec¬ 
ondaries, 14. Tail long, about two-thirds the wing, even, or very 
slightly rounded ; composed of Hi feathers, the basal halt overlaid by 
the coverts. 
SPIZIASTUK MELANOLEUCUS. 
Buteo melanoleucus Yieill. N. D. iv, 1816, 4'2. —Cuvier, Reg, An. 1817,336. — Vieile. 
Oup. Gal. Ois. 1825, pi. 14. 
Spizaetus melanoleucus Boxap. Consp. i, 1850, 28; Rev. Zool. 1850,448. — Strickl. 
Orn. Syn. i, 1855, 73. —Sche. Mas. P.-B. Astnres, 1862, 14. — Lawr. Ann. Lye. 
N. Y. i’x, 1868, 132 (Costa Rica).— Gray, Hand List, i, 1869, 12. — Sce. & Salv.. 
P. Z. S. 1864, 369 (Istli. Panama); Nom. Neotr. 1873, 120. 
Spizaetus ( Spizastur ) melanoleucus Ridgw. Pr. Boston Soc. N. H. 1873, 71. 
Spizastur melanoleucus Siiarpe, Cat. Acc. B. M. 1874, 258. 
Falco atricapillus Temm. PI. Col. i, 1823, pi. 79. 
Morphnus ? atricapillus Yig. Zool. Journ. i, 1824, 325 .—Stephens, Zoology, xiii, 20. 
Astur atricapillus Less. Man. i, 1828, 93. 
Spizastur atricapillus Gray, List Gen. 1841, 3. — Kaup, Mas. Senck. iii, 1845, 259. 
Spizaetus atricapillus Gray, Gen. 1845, 14.— Boxap. Consp. Av. i, 1850, 28.— Burm. 
Th. Bras. 1856, 65.-— Peez. Orn. Bras. 1871, 4. 
“ Spizastur airiceps Kaup, Mus. Senck. iii, 1845, 259” ( fide Strickland, l. c.). 
JFfab. _Central Tropical America, south to Brazil, north to Guatemala. 
Guiana (Mus. Boston Soc.) ; Costa Rica (Nat. Mus.). 
Wing, 14.30-16.40; tail, 9.50-11.00; culmen, 0.95-1.20; tarsus, 2.G5- 
3.25 : middle toe, 1.95-2.25. Adult Upper parts uniform deep black; 
tail deep black, crossed by four broad bands of brownish-gray, and nar¬ 
rowly tipped with paler. Head, neck, and entire lower parts pure white; 
lores and eyelids deep black, and occiput spotted with the same. Tibiae 
sometimes sparsely barred with black. Cere and rictus deep orange-red 
in life; bill black. 
List of specimens examined—In Nat. Mus., 1 (No. 51302, La Palma, Costa Rica, Ang. 
10. 1867 ; Jose C. Zcledon); nans. Philad. Acad., 3 ; Boston Soc. N. H., 2 ; G. N. Law¬ 
rence. 1 : total, 7. 
