BIRDS OF NORTH AND MIDDLE AMERICA 117 



same width (3-4 mm. wide), the sides of the breast, and to a lesser 

 extent the dark bars on the breast and sides, sometimes even on the 

 abdomen and flanks, washed with bright russet, the sides of the breast 

 practically soUd russet; under wing coverts and bend of wing whitish 

 to ivory yellow; under tail coverts whitish to cartridge buff; iris dull 

 orange-red ; cere and edge of gape light olive-green; maxilla dull black, 

 bluish at extreme base below cere; mandible greenish horn, tip dusky; 

 tarsi and feet orange-yellow; claws black. 



Adult female. — Similar to male but with very much m.ore russet on 

 the underparts, the pectoral, abdominal, and crural bars being often 

 dark chestnut with almost no trace of deep mouse gray. 



Young (sexes alike). — Entire upperparts sepia, mottled with white 

 on the occiput and nape, darkest on the forehead and crown; the 

 scapulars each with a subterminal large white patch, which sometimes 

 shows through the overlying feathers giving a mottled appearance; 

 the upper wing coverts and remiges narrowly tipped with whitish; 

 retrices as in adult, but slightly paler and with the whitish bars more 

 hair brown medially as though composed of two whitish lateral areas 

 connected by a grayish hair brown median area; sides of crown, 

 superorbital and auricular area sepia faintly and narrowly streaked 

 with pale cinnamon ; cheeks sepia vary faintly streaked with avellane- 

 ous; chin, throat, breast, abdomen, sides, flanks, and thighs whitish 

 to cartridge buff heavily streaked with dull fuscous, the throat with 

 only a single median streak; the streaks becoming shorter and more 

 like apical spots on the abdomen; and widening to form bars on the 

 lower sides and flanks; under tail coverts whitish, unstreaked; under 

 wing coverts ivory white to pale buff at the axillars. 



Natal down. — Not known. 



Adult male.—Wmg 202-203 (202.5); tail 140.5-146 (143.2); culmen 

 from cere 15.5-16.5 (16); tarsus 41.5-42 (41.7); middle toe without 

 claw 26-27.5 (26.7 mm.) (2 specimens). 



Adult female.— Wmg 222-226 (224); tail 153-158 (155.5); culmen 

 from cere 16.5-17.5 (17) ; tarsus 44-45; middle toe without claw 28-28.5 

 (28.2 mm.) (2 specimens). 



Range. — Tropical zone from southern Mexico (Valley of Mexico; 

 Cacoprieto, Santa Efigenia, Oaxaca; Potrero, Cordoba, Veracruz) 

 south through Guatemala (Vera Paz), Nicaragua (San Juan del Sur; 

 Sucuya; La Libertad; Chontales); El Salvador (Volcan de Concha- 

 gua); Costa Rica (Escazii; Gudcimo, Rio Banana; Cuabre de Tala- 

 manca); to the Chiriqui district of Panama (David, Bogaba) and to 

 Colombia (west of eastern Andes and western Ecuador), 



Type locality. — Guatemala. 



Harpagus bidentatus (not Falco bideniatus Latham, 1790) Sclater and Salvin, 

 Ibis, 1859, 219 (Guatemala); Proc. Zool. Soc. London, 1864 (Panama). — 



