54 FALCONIDA. 
having been recorded both from British Honduras as well as from the Republic cf 
that name +. 
Mr. Ridgway !7 states that M‘Leannan’s specimens from Panama named G. ce@rulescens 
by Lawrence} are exactly intermediate in colour between that form from Brazil and 
G. niger from Mexico. Our birds from the State of Panama, a little further to the 
westward *, agree with the northern ones. 
ARCHIBUTEO. 
Archibuteo, Brehm, Isis, 1828, p. 1269; Sharpe, Cat. Birds Brit. Mus. i. p. 195. 
A genus of the Northern Hemisphere, two species being found in North America— 
one of them, Archibuteo ferrugineus, occurring in Northern Mexico. In size and 
general features the resemblance between Archibuteo and Buteo is very great, but the 
former genus may at once be distinguished by having the front and sides of the tarsi 
feathered, while in the species of the latter genus the feet are bare. The wings are 
long and pointed, the fourth quill being the longest and the first to the fourth emar- 
ginate on the inner web; the tail is nearly even; the toes short, the claws small but 
stout. The nostrils are irregularly oval, with no visible central tubercle ; they are 
slightly covered by upcurving loral bristles ; the tomia of the maxilla has no notch and 
is but slightly festooned. A more pronounced difference between the genera Buteo and 
Archibuteo consists in the transversely-plated hinder aspect of the tarsus in the former 
genus, instead of the reticulated and more Aquiline character of the scales in Archibuteo. 
This feature, however, is not at once apparent, owing to the feathered covering of the 
tarsus in the latter genus. 
—1. Archibuteo ferrugineus. 
Falco ferrugineus, Licht. Abh. k. Ak. Berl. 1838, p. 428°. 
Archibuteo ferrugineus, Gray, Gen. Birds, p. 12°; Cassin, Birds Cal. & Texas, pp. 104, 159, t. 26°; 
Ridgw. in Baird, Brewer, & Ridgw. N. Am. Birds, iii. p. 8300*; Sharpe, Cat. Birds Brit. 
Mus. i. p. 199°; Bendire, Life Hist. N. Am. Birds, p. 259, t. 9. ff. 1,2, 4°; A.O. U. 
Check-list N. Amer. Birds, 2nd ed. p. 135’. 
Supra ferrugineus, plumis omnibus medialiter fuscis ad basin albis; alis griseo-fuscis, secundariis albido 
terminatis et indistincte fusco fasciatis, subtus fere albis: subtus albus, plumarum rhachidibus strictissime 
fuscis, hypochondriis fusco sparsim maculatis; tibiis et tarsis plumosis ferrugineis, fusco crebre trans- 
fasciatis ; cauda supra ferrugineo lavata ad basin griseo irrorata, subtus pure alba: cera et digitis flavis. 
Long. tota circa 23-0, alee 17°5, caude 9-3, tarsi 3-4. (Descr. exempl. ex Mexico. Mus. Brit.) 
Juv. Supra fere omnino fuscus, colore ferrugineo absente ; tibiis et tarsis albidis, fusco maculatis. 
Hab. Western Norta America, from the Plains (Eastern North Dakota to Texas) 
westward to the Pacific, and from the Saskatchewan region south into Mexico 7.— 
N. Mexico, Real del Monte (Mus. Brit.°). 
We have not received any skins of this species from our collectors in Mexico, 
