139 
Genus HETEROSPIZIAS, Sharpe. 
Urubitinga Auct. (»ec Lafrissxaye). 
Spizigeranus Gray, Hand List, i, 1869, 9 (nec Kaup, 1844). 
Heterospizias Sharpe, Cat. Acc. B. M. 1874, 160. Type Falco meridionaHs Gm. 
Ch.—S imilar to Urubitinga , but wings larger proportionally, reaching 
to or beyond the end of the comparatively short tail. Tibial plumes 
better developed, and feathers of the pileum longer and more lanceo¬ 
late. Plumage more variegated, rufous prevailing. Five outer pri¬ 
maries with inner webs sinuated ; third, fourth, and fifth quills nearly 
equal and longest, the fourth usually exceeding the rest; first shorter 
than the seventh. Tail more than half as long as the wing, slightly, 
but decidedly, emarginated, the lateral pair being longest.* Tarsus 
much more than twice as long as middle toe; outer toe nearly as long 
as the middle; inner much shorter; hind toe a little shorter than the 
inner. Claws moderate in size, of normal form, decidedly graduated, 
the outer being only about half the length of the posterior, which is. 
equal to its digit. Toes with large transverse plates in an uninter¬ 
rupted series, and tarsus with continuous frontal and posterior series of 
similar scutellae. A well-developed web between outer and middle toes. 
Less than one-third the upper portion of the tarsus feathered in front. 
Bill rather small, exactly as in Urubitinga antliracina. 
With a general correspondence to Urubitinga in most of the external 
features of form, this genus, or more properly subgenus, differs suffi¬ 
ciently in the greater development of the remiges and tibial plumes, 
the more lanceolate form of the feathers of the pileum, and the strik- 
inglv different coloration. 
HETEROSPIZIAS MERIDIONALIS. 
Falco meridionaHs Lath. Ind. Orn. i, 1790, 36. 
Rupornis meridionaHs Kaup, Contr. Orn. 1850, 63. 
Buteogallus meridionaHs Scl. P. Z. S. 1860, 223. 
Buteo meridionaHs Sciil , Mus. P.-B. Buteones, 1862, 17; Rev. Acc. 1873, 110.— 
Gray, Hand List, i, i860, 9. 
Urubitinga meridionaHs Sen. & Salt. P. Z. S. 1867, 589 ; 1869, 252 (Plains of Valen¬ 
cia, Venezuela); ib. 634 (Arg. Rep.); Norn. Neotr. 137.3, 119.— Wyatt, Ibis, 
1871, 382. —Pelz. Orn. Bras. 1871, 7, 394.— Lee, Ibis, 1873, 136 (Arg. Rep.). 
Urubitinga (Spizigeranus ) meridionaHs Ridgw. Pr. Boston Soc. N. H., May, 1373, 63. 
Heterospizias meridionaHs Sharpe, Cat. Acc. B. M. 1874, 160. 
Circus rufulus Vieill. N. D. iv, 1816, 466. 
Astur rufulus Strickl. Orn. Syn. i. 1855, 422. 
Falco rutilans Liciit. Verz. Doubl. 1823, 60 .—Tkmm. PI. Col. i, 1824, pi. 25. 
Circus rutilans Steph. Gen. Zotil. xiii, 1826, 43. 
Buteo rutilans Less. Man. i, 1823, 104. 
Hypomorplinus rutilans Caban. Arch. f. Naturg. 1814, 264 ; Tscbiuli Fauna Per. 1844, 
17, 84. 
Asturina rutilans Burm. Th. Bras, ii, 1856, 80. 
Aquila buson Spin, Av. Bras, i, 1824, 6. 
Ilufous-headed Falcon Lath. Gen. Synop. Suppl. 1787, 33. 
Gavilan dc estero Acanelada Azara, Pax. Par. i, 1802, 72.— IIartr. Ind. Azara, 1847, 1. 
Hab. —South America, from New Granada to Paraguay and Buenos 
lyres. 
"Wing, 15.10-18.50; tail, 8.00-11.00; culmen, 1.00-1.10; tarsus, 
3_S0_4.50; middle toe, 1.65-1.85. Adult :—General color pale cinna- 
* Remises 25. Pterylosis as in Buteo, but external branch of the pectoral stem of the 
inferior tract only half free, as in Haliaetus— (Nitzsch.) 
