448 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Spizaetus ornatus vicarius Friedmann, Journ. Washington Acad. Sci., xxv, 1935, 

 451 (orig. descr. ; near Manatol Lagoon, Brit. Honduras; type in Carnegie 

 Mus.) — VAN RossEM, Birds El Salvador, 1938, 127 (distr. in El Salvador; 

 colors of soft parts; habits). — Sassi, Temminckia, iii, 1938, 301 (Costa Rica, 

 Porto Jiminez and Castilla; spec). — Traylor, Publ. Field Mus. Nat. Hist., 

 zool. ser., xxiv, 1941, 199, 203 (Pacaitun, Yucatdn; spec). 



SPIZAfiTUS TYRANNUS (Wied) 



Tyrant Eagle-Hawk 



Adult (sexes alike in coloration) . — All feathered parts of head deep 

 black, the feathers of the crown and occiput with the underlying por- 

 tion pui'e white, much of w^hich usually shows through; a broad, short 

 occipital crest of slightly lengthened, rather cuneate feathers; scap- 

 ulars, interscapulars, back, upper whig coverts, chin, throat, breast, 

 sides, and anterior part of abdomen pm-e black; remiges externally (in 

 folded wing) fuscous-black to black; crossed by five or six fuscous bars 

 about equally spaced, the bars slightly narrower than the black inter- 

 spaces and becoming mottled or edged with white on the inner margin 

 of the inner webs, these bars grayish white on the under surface of the 

 remiges; fifth to sixth primaries longest, first shorter than eighth, the 

 outer five with their inner webs sinuated; rump and upper tail coverts, 

 especially the latter, black, each feather crossed by two or three narrow 

 white bars which are mottled v/itli slightly brownish gray; and, in 

 fresh plumage, narrowly tipped with white; rectrices black becoming 

 whitish basally, and crossed by four broad deep ashy gray bands 

 m.ottled with pale fuscous and whitish; narrowly tipped with whitish; 

 all the tail bands white on the under surface; lower abdomen and 

 flanks black more or less spotted with narrow semitransverse white 

 flecks; thighs black narrowly barred with white, the black interspaces 

 broader than the white bars; under tail coverts like the flanks, but with 

 the white bars still more broadly spaced; under wing coverts black 

 barred with white; the black and white more nearly alike m width; 

 lores plumbeous; u'is, tarsi, and toes orange-yellow; bill and claws 

 black, the lower part of the mandible somewhat plumbeous. 



Immature (sexes alike). — Different from the adult. Top of head 

 from forehead to nape white, more or less w^ashed with pale tawny- 

 buff and heavily streaked or blotched with fuscous to fuscous-black; 

 scapulars, interscapulars, upper back, and upper wing coverts dark 

 sepia to fuscous; remiges fuscous to dark fuscous crossed by six or 

 seven sepia bands becommg whitish at the imier edge of the inner web ; 

 the sepia bands whitish on the under side of the feathers; lower back, 

 rump, and upper tail coverts fuscous to fuscous-black barred with 

 white; rectrices similar to those of the adult, but the brownish gray 

 bands more mottled with whitish, and with five, mstead of four, 

 fuscous-black bands; chin and throat whitish heavily streaked with 



