56 FALCONIDA. 
A. Five outer primaries emarginate ; tail more than two-thirds the wing ; bill high at the base; 
nostrils oval, with eccentric tubercle *. (Parabuteo.) 
B. Four outer primaries emarginate. 
Tail about one-third the wing. (Zachytriorchis.) 
Tail about half the wing. (Buteo.) 
C. Three outer primaries emarginate. (Buteo partim, Buteola.) 
The wings in Buteo are long and pointed, the third and fourth quills the longest. 
The bare tarsi are scutellate in front and behind, reticulate on the sides; the toes 
relatively much longer than in Archibuteo and with long strong claws. The bill has 
no notch and the tomia is but slightly festooned; the nostrils are irregularly oval and 
(except, perhaps, in Buteo harrisi) without central tubercle. 
Section A. Vajores. Ale remigibus externis quinque in pogonio interno excisis, 
—1. Buteo harrisi. 
Falco harrisii, Audub. Birds Amer. t. 3921; Orn. Biogr. v. p. 30°. 
Craxirex harrisii, Coues, Proc. Acad. Phil. 1866, p. 49°. 
Antenor harrisii, Gurney, Ibis, 1875, p. 284". . 
Hypomorphnus unicinctus (nec Temm.), Cab. & Tschudi, Faun. Peruan. pp. 17, 85°. 
Polyborus teniurus, Tschudi, Arch. f. Naturg. 1844, p. 263°. 
Urubitinga unicincta (nec Temm.), Scl. & Salv. Ibis, 1859, p. 2167; Duges, La Nat. i. p. 138°. 
Spizageranus unicinctus (nec Temm.), Scl. P. Z.S. 1860, p. 288°. 
Craxirex unicinctus (nec Temm.), Salvin, P. Z. S. 1867, p. 158”°. 
Morphnus unicinctus, Finsch, Abh. nat. Ver. Bremen, 1873, p. 363”. 
Erythrocnema unicincta, pt. (nec Temm.), Sharpe, Cat. Birds Brit. Mus. i. p. 85°; Sumichr. La 
Nat. v. p. 285. 
Antenor unicinctus (nec Temm.), Berl]. Ibis, 1884, p. 436 ™. 
Parabuteo unicinctus, var. harrisi, Ridgw. in Baird, Brew., & Ridgw. N. Amer. Birds, i. p. 250”. 
Craxirex unicinctus, var. harrisi, Lawr. Mem. Bost. Soc. N. H. ii. p. 802. 
Antenor unicinctus, var. harrisi, Lawr. Bull. U. S. Nat. Mus. no. 4, p. 42". 
Buteo unicinctus harrisi, Sennett, Bull. U. 8. Geol. Surv. v. p. 419. 
Parabuteo unicinctus harrisi, Nutting, Proc. U. 8. Nat. Mus. v. p. 404°; Belding, op. cit. vi. 
p. 843 *°; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 126”; Bendire, Life Hist. N. Am. 
Birds, i. p. 20, t. 6. figs. 8, 4; Cherrie, Auk, ix. p. 828”; Fisher, Bull. U. 8S. Dep. Agr. 
no. 8, p. 47**; A. O. U. Check-list N. Amer. Birds, p. 129”. 
Supra fumoso-brunneus, dorso postico sordide ferrugineo, nigro maculato; supracaudalibus et caude parte 
basali albis; rectricibus nigricantibus, late albo terminatis; alis nigricanti-brunneis, tectricibus alarum 
minimis castaneis, medianis brunneis, castaneo marginatis: subtus omnino brunneus, concolor ; tibiis 
lete castancis ; crisso et subcaudalibus pure albis; subalaribus castaneis, nigro medialiter notatis: rostro 
plumbeo, ad apicem nigro; cera et pedibus flavis; iride brunnea. Long. tota circa 22-5, ale 14-0 
caude 9°45, tarsi 3°7. (Descr. feminew ex Rio Grande city, Texas. Mus. nostr.) 
* This latter character cannot always be detected in skins. 
