OCR Text |
Show 174 GENUS LEUCOPTERNIS, KATJP. Dasdalion VIGORS, 1824 ( not of Savigny, 1809). [ Fide G. R. Gray.] Leucopternis KAUP, Isia, 1847, 210. Type, Falco melanops TBMMINCK. Pseudastur BLYTH, Cat. Birds Mas. Asiat. Soc. Bengal, 1849, 24. Type, Falco laccrnu latus TEMM. CH.- Similar to Urubitinga^ bnt tarsus not more than twice as long as the middle toe; inner webs of only four or five outer primaries cnt ( the cutting being a distinct emargination); and nostril more nearly circular, and rather vertical than horizontal. This genus is most similar to Urubitinga, but presents the above well-marked differences, with the addition of another and equally important one, viz, the similarity of the young and adult stages in plumage. The colors, too, are chiefly or largely white, instead of maiuly black. There is also a very close relationship to Asturina, but in the latter the old and young stages of plumage are exceedingly dissimilar, the nostril is very decidedly horizontal, and the emarginations of the primaries end abruptly with the fourth, on which it is very distinct The genus Bupornis, next in order of relationship, is still more remotely allied. The sternum of L. semiplumbeus most resembles that of Asturina plagiata ( it has not been compared with that of A. nitida), from which it differs mainly in smaller size. That of Rupornis { ruficauda) differs conspicuously in much greater posterior breadth and larger foramina, which in the other two are sometimes nearly or quite obsolete, and always small. LEUCOPTERNIS GHIESBRECHTI. Buteo ghiesbr% chii DUBUS, Eaq. Orn. 1843, pi. 1.- GRAT, Gen. fol. sp. 18.- STRICKL. Oro. Syn. i, 1855, 36.- SCL. P. Z. S. 1857, 227 ( Southern Mexico).- SCL. & SALV. Ibis, 1859, 217.- LAWR. Ann. N. Y. Lye. vii, 1861, 289.- SAL v. P. Z. S. 1867,158 ( Veragaa).- GRAY, Hand List, i, 1869, 8.- SUMICHRAST, Mem. Boat. Soc. N. H. i, 1869, 560 ( Vera Cruz, hot re*.). Leucopternis ghiesbreghti BONAP. R. Z. 1850, 481; Coosp. 19.- SCL. & SALV. EX. Orn. 1868,121; Nom. Neot. 1873,119.- SALV. P. Z. S. 1870, 250; Ibis, 1872,242. Tachytriorchis ghiesbrechti BON. C. R. xli, 1855, 651. Asturiva ghiesbrechti SCHL. MUS. P.- B. Asturinae, 1862,11. * Unibitinga ghiesbrechti SHARPS, Cat. Ace. B. M. 1874, 217. Hab.- Middle America, from Panama to Mirador. Wing, 12.00- 15.25; tail, 8.50- 9.50; culmen, 1.05; tarsns, 2.80- 3.65; middle- toe, 1.50- 1.70. Fourth or fifth quills longest; first shorter than seventh, sometimes shortest. Almost entirely pure white; a broad zone across the tail near its end, and a portion of the primaries, primary- coverts, and alulae deep black. Adult:- Basal half or more of the primaries white; no bars on the wing. Young:- Primaries black nearly to the base, or else the white portion barred with blacfc: wing-coverts more or less barred with black on the lower feathers. Loral bristles and streak behind the eye black. In the youngest specimens,, the black portion of the primaries barred with paler. |