672 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Juvenal (sexes alike). — Upperparts as in adult, but the feathers 

 with the margins dull tawny instead of dark plumbeous, the margins 

 practically wanting on the head and nape; remiges as in adult, but the 

 inner webs washed with fuscous ; tail as in adult ; chin and upper throat 

 with a faint buff wash; lower throat and breast heavily washed with 

 very pale cinnamon, which darkens posteriorly to pale cinnamon, 

 the feathers of the breast with conspicuous, terminally broadening 

 black shaft stripes; upper abdomen, sides, flanks, and under wing 

 coverts as in adult, but with the pale bars narrower and therefore 



Figure 48. — Falco {Neofalco) albigularis. 



less conspicuous; lower abdomen pale tawny buff with broad wedge- 

 shaped blackish shaft streaks; thighs pale tawny-buff barred with 

 blackish; under tail coverts as in adult, but the pale bars pale warm 

 buft*, not ochraceous buff. 



Natal down. — Apparently unknown. 



Adult male. — -Wing 248; tail 128; culmen from cere 18; tarsus 43; 

 middle toe without claw 46 mm. (1 specimen from Costa Rica). 



Adult female.— Wing 275-287 (281.2); tail 139-141 (140); culmen 

 from cere 21.5-23.5 (22.5); tarsus 47-5G (49.5); middle toe without 

 claw 48-50 (49 mm.) (4 specimens from Peru, Venezuela, and with- 

 out locality). 



Range. — Resident from southern Mexico (Tecolutla, Veracruz); 

 south through Guatemala (Vera Paz, Finca el Cipres); Nicaragua 



