161 



Genus ANTENOR, Eidgway. 



' Craxircr, Gould "', C.vssix, Birds N. Am. 1858, AG, ct auct. (not of Gould, 1841). 

 J/iicHor KiDGWAV, Proc. Boston Soc. Nat. Hist. Ma j% 1873, G3. Type, Falco unicinctns 



Temm. 

 "rarahitfeo Ridgway'', B. B. & E. Hist. N. Am. Birds, iii, Jan. 1874, 248. Same type.* 

 Evyihrocnema Suaiu'E, Cat. Ace. Brit. Mus. July, 1874, 84. Same type. 



Ch. — Similar to B?tfco, but five, instead of three or four, outer priuia- 

 ries, with ini>er webs emarginated. Bill as in Buteo, but superior tomium 

 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 longer than its digit; scutellation typically buteonine; number of 

 transverse plates in front varying from 11 to 12; upper i)ortion 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. horealls 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 Uru- 

 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 Antenor is very similar to that of Bateo horealis, 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. 



AiJTENOE UyiCIXOTUS. 



«. unicinctus, Temminck. 



Falco unidncius Temm. PL Col. i, 1824, pi. 313. 



MorpJinus unicinctus Less. Man. i, 1828, 90. 



Jstur uiiiciuctus Cuv. Peg. An. i, 1829, 322. — Gray, Gen. i, 1649, 27. — Kaut, Contr. 



Orn. 1850, 66. — Stkickl. Oru. Syn. i, 1855, 221 (in part). 

 Xisus unicincius Less. Trait6, 1831, 61. 



Buteo vnicnictus Gkay, List Ace. B. M. 1844, 18 ; Hand List, i, 1869, 7. 

 Hypomorphuus unicinctus Cabax. Arch. f. Natnrg. 1844, 263; Fann. Per. 1844, 17, 85. 

 Spizagcmnus unicincius Kaup, Mns. Seuck. iii, 1845, 260. — ScL. P. Z. S. 1860, 288. 

 Craxirex unicincius BoxAP. Rev. et Mag. Zool. 1854. 537. — Oktox, Am. Nat. 1871, 624 



(Qnito Valley). 

 Asturina unicincta BuRM. Th. Bras, ii, 185.5, 82; Reis. La Plata-St. ii, 1861, 436. — 



SCTIL. Mns. P.-B. Asturina?, 1862, 2. 

 Unihitinqa unicincta Lafr. R. Z. 1849. 99.— SCL. P. Z. S. 1858. 150.— Pelz. Orn. Bras. 



i, 1868, 3, No. 10; iv, 1871, 2, 394.— ScL. As Salv. P. Z. S. 1868, 143 (Buenos 



Ayres) ; ib. 175, 570 (Peru) ; Norn. 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. 



