578 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



green (all being intense poppy-red in the adult).* The larger wing- 

 coverts and tertials margined terminally with light yellowish green. 



Family FALCONID^. 

 54. Buteo brachyurus Vieill. 

 A young male, which may be described as follows : 

 Young $ (So. 102,855, U. S. Nat. Mus., Coznmel I., Yucatan, Janu- 

 ary 24, 1885) : Upi)er parts nearly uniform dull dusky brown, the head 

 rather darker, or blackish brown, much broken by white streaki ug, the 

 whole basal portion of the feathers being white; feathers of nape and 

 upper part of back also white beneath the surface, the division of the 

 white and brown directly transverse; scapulars with decidedly but in- 

 distinctly lighter brown margins, these edgings incliningou some feathers 

 to dull ochraceous. Outer surface of primaries uniform brownish black. 

 Tail dull grayish brown, with indications, most distinct next the shaft, 

 of about seven narrow dusky bands, the last of which is much broader 

 than the rest. (These bands scarcely show at all when the tail is closed, 

 except on the middle rectrices.) Tip of tail narrowly and indistinctly 

 pale brownish gray. Forehead and anterior portion of lores immaculate 

 white; sides of hea^d, including superciliary and supra-auricular regions, 

 suborbital region and auriculars, streaked with white and dusky, in 

 nearly equal proportion; sides of neck similarly but more broadly 

 streaked, and slightly mixed on the lower portion with rusty ochraceous. 

 Entire lower parts, from chin to crissum, including the whole lining of 

 the wing, axillars, and greater extent of under surface of remiges (in 

 closed wing), immaculate white, the upi^er portion of outer side and 

 whole of inner side of tibiae deep creamy buft", or light ochraceous. 

 Tail slightly emarginate when closed, truncate when spread; third and 

 fourth quills longest, the others succeeding in the following order: 5th, 

 2d, 6th, 7th, 8th, 1st, 9th, 10th, the 1st and 8th being very nearly 

 equal, however. Only three outer primaries with inner webs distinctly 

 emarginated, but fourth showing an appreciable sinuation. Wing, 

 10.50; tail, 6.00; culmeu, .68; tarsus, 2.30 (unfeathered i3ortion 1.35); 

 middle toe, 1.40. 



X- 55. Rupornis magnirostris gracilis Eidgw. 



Asturina riificauda Salv. Ibis, April, 1885, 193 (nee SCL. & Salv., P. Z. S. 



1869, 133). 

 I^n2)orni8 gracilis EiDGW. Proc. U. S. Nat. Mus. VIII, May 20, 1885, 94. 

 SUBSP. CHAR. — Similar to B. magnirostris griseocauda, EiDaw.,t but 



* Only the longest feather of the alula is present. In the adult the shortest (last) 

 is red, like the primary coverts, and this feather is jiroiably green in the young. 



\ Buteo {Buporms) magnirostris, c. var. griseocauda, Ridgw., Proc. Boston Soc. N. H., 

 May 21, 1874, 88. — Rupornis magnirostris (Gmel.), is a name which in all probability 

 should cover a variable species, the range of which exteuds from southern Mexico to 

 Bolivia and the Argentine Republic, and to the several more or less strongly charac- 

 terized geographical races to which different specific names have been given. These 



