246 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 150 



most or tenth, instead of the reverse. The whole wing appears 

 more pointed, the tail is relatively shorter, the cere proportionately 

 larger, and the bristly feathering of the lores more abundant. 



MORPHNUS GUIANENSIS (Daudin): Crested Eagle; Aguila Monuda 



Falco guianensis Daudin, Traite Elem. Compl. Orn., vol. 2, May 1800, p. 78. 

 (French Guiana.) 



Size large ; head crested ; tail nearly as long as wing ; body form 

 slender; varying from white underneath to lightly banded with cin- 

 namon, or in some heavily banded with black. 



Description. — Length 710 to 830 mm. Adult, light phase, crown, 

 sides of head, basal crest feathers, hindneck, and band across lower 

 f oreneck and upper breast gray ; crown feathers streaked and spotted 

 with dark neutral gray ; elongated central crest feathers white at base, 

 black on tips; upper surface black, with rump and upper tail co- 

 verts white; wing coverts tipped and mottled with gray; primaries 

 and secondaries mottled obscurely with gray; tail black, with white 

 tip and 3 broad cross bands of gray, mottled with mouse brown; 

 throat white; lower surface from gray breast band to under tail 

 coverts white, with narrow bars of cinnamon, lined with gray; un- 

 der surface of wing white, becoming gray on the outer half of the 

 primaries, which are gray banded with black. 



Immature, crown, sides of head, crest, and under surface white, 

 washed with pale gray on crown and upper breast; upper surface 

 dull black, with wing coverts freckled with white and gray, and wings 

 with irregular gray bars spotted with black ; under surface of wings 

 as in adult. 



Dark phase, crown and sides of head dark gray; above black, 

 with the wing coverts tipped lightly with white, and the wings faintly 

 freckled with gray; tail banded with gray, mottled with black, and 

 tipped with white ; breast band black ; rest of lower surface, including 

 under wing coverts white, barred heavily with black. (The dark in- 

 dividuals are less common.) 



A male, in dark phase, taken on the Cerro Azul, had the following 

 colors : Iris hazel ; bill dull black ; cere and loral area (bare except 

 for scattered bristles) dark neutral gray; tarsus and toes dull yellow; 

 claws black. 



Measurements (from specimens from Panama, Colombia, and the 

 upper Amazon). — Males (7 specimens), wing 425-449 (437), tail 

 340-380 (364, average of 5), culmen from cere 30.1-33.6 (32.6, 

 average of 6), tarsus 105.2-117.7 (110.9) mm. 



