161 
Genus ANTENOB, Bidgway. 
‘ Craxirex Gould ”, Cassin, Birds N. Am. 1853,46, et auct. (not of Gould, 1341). 
Anterior Ridgway, Proc. Boston Soc. Nat. Hist. May, 1873, 63. Type, Falco unicinctus 
Temm. 
“Parabuteo Ridgway ”, B. B. & R. Hist. N. Am. Birds, iii, Jan. 1874,243. Same type/ 
Erytliroonema Sharpe, Cat. Ace. Brit. Mus. July, 1874, 84. Same type. 
Ch.—S imilar to Buteo, but live, instead of three or four, outer prima¬ 
ries, with inner websemarginated. Bill as in Buteo , but superior toinium 
rather more distinctly lobed, and upper outline rather more ascending 
basally. Tarsus about twice the length of the middle toe; outer toe 
slightly longer than the inner, which very slightly exceeds the posterior 
toe; claws strong, well curved, typically buteonine, the posterior equal to 
or louger than its digit; scutellation typically buteonine; number of 
transverse plates in front varying from 11 to 12; upper portion of the 
tarsus feathered in front for nearly half its length. Wing moderately 
long, the third, fourth, or fifth quills longest; first shorter than the 
eighth; outer five with their inner webs emarginated, the cutting being 
very indistinct, however, on the fifth. Tail long, about two-thirds the 
wing, even, or very slightly rounded. Lore very scantily feathered, the 
bristles being very fine and scattered. 
The more closely we have examined this form, the more difficult it has 
become to appreciate constant characters separating it from Buteo, with 
the more compactly built members of which, as B. borealis and its allies, 
it agrees very closely in the details of external form. The main differ¬ 
ences consist in the longer tail, more scantily-bristled lores, and the 
emargination of the fifth primary. It is far less closely related to Urii- 
bitinga , though we had previously hinted at such a relationship, the 
latter genus differing in much shorter, more rounded wing, with the 
inner webs of the primaries very shallowly sinuated. To Astur , it is far 
more remotely allied, the osteological as well as external differences 
being very striking. 
The cranium of Anterior is very similar to that of Buteo borealis, the 
details of structure being exactly the same, the only differences being 
slight ones of contour. Its upper portion is more depressed, presenting 
in this respect a closer resemblance to that of Asturina. 
ABTENOB UNICIXCTGS. 
a. unicinctus, Temmiuck. 
Falco unicinctus Temm. FI. Col. i, 1324, pi. 313. 
Morplmus unicinctus Less. Man. i, 1828, 90. 
Astur unicinctus Cuv. Reg. An. i, 1829, 322. — Gray, Gen. i, 1849, 27.—Kaup, Contr. 
Orn. 1850, 66. — Strickl. Orn. Syn. i, 1855, 221 (in part). 
Xisus unicinctus Less. Traits, 1831, 61. 
Buteo unicinctus Gray, List Acc. B. M. 1844, 13 ; Hand List, i, 1869, 7. 
Hypomorphnns unicinctus Caban. Arch. f. Naturg. 1844, 263; Faun. Per. 1844, 17, 85. 
Spizageranus unicinctus Kaup, Mus. Senck. iii, 1845, 260. — Scl. P. Z. S. 1860,288. 
Craxirex unicinctus Boxap. Rev. et Mag. Zool. 1854. 537. —Orton, Am. Nat. 1871, 624 
(Quito Valley). 
Asturina unidneta Burm. Th. Bras, ii, 1855, 32; Reis. La Plata-St. ii, 1861, 436.— 
Sciil. Mus. P.-B. Asturinse, 1862, 2. 
Urubitinga unicincta Lafr. R. Z. 1849, 99. — Scl. P. Z. S. 1358. 150.—-Pelz. Orn. Bras, 
i, 1868, 3, No. 10: iv, 1871, 2, 394.— Scl. & Salv. P. Z. S. 1868, 143 (Buenos 
Ayres); ib. 175, 570 (Peru); Nom. Neotr. 1873, 119 (part). 
* The publication of this name was the result of an unfortunate oversight of the print¬ 
ers in correcting from the last revised proof-sheets.—R. R. 
