248 PROCEEDINGS OF THE ACADEMY OF [June-Oct., 



PHALACROCORAOID^. 



67. Phalacrocorax vigua vigua (Vieillot). Brazilian Cormorant. 



Female, Gatun Lake, December 17, 1911. One of a flock roosting 

 in a dead tree in the water. It is in the brown immature plumage. 



SULID.^. 



68. Sula leucogastra (Boddaert). Booby. 



Female in brown immature plumage secured at sea sixty miles north 

 of Colon, December 4, 1910. Iris grayish-white, bill dark bluish- 

 horn color lighter at the tip, tarsi bluish-white, feet yellowish. 



PELECANID^. 

 [69.] Pelecanus occidentalis Linnseus. Brown Pelican. 



FRBGATID^. 

 [70.] Fregata minor palmerstoni (Gmelin), Pacific Man-o'-war Bird. 



CATHARTID^. 



[71.] Gypagus papa (Linnaeus). King Vulture. 



[72.] Cathartes aura aura (Linnseus). Turkey Vulture. 



[73.] Catharista urubu (Vieillot). Black Vulture. 



FALOONID^. 

 74. Ibycter americanus (Boddaert). Red-throated Caracara. 



Male, Rio Indis, four miles from Gatun, November 19, 1911. Iris, 

 bare skin of throat and face and tarsi orange red, claws black, bill 

 yellow, cere grayish-blue. 



[75.] Milvago chimachima (Vieillot). Yellow-headed Caracara. 

 *76. Circus hudsonius (Linnseus). Marsh Hawk. 



Female, Gatun, December 11, 1910. Iris dark brown, bill horn 

 color black at tip, cere and feet yellow. 



One of a pair which beat along the shores of Gatun Lake daily for a 

 week or more. A common species in winter. 



[77.] Micrastur melanoleucus (Vieillot). Black and White Hawk. 



[78.] Micrastur mirandollei (Schlegel). 



79. Micrastur guerilla interstes Bangs. Cassin's Barred Hawk. 



Male, Agua Clara, May 19, 1912, and female, Gatun, August 27, 

 1911, both in immature plumage, are referred to this species. " The 

 male is marked above with indistinct buff transverse spots on the 

 wings and interscapulum and with narrow dark-brown bars below. 

 The female is plain buff except on the sides of the breast and flanks, 

 where there are a few transverse brown bands partially obscured by 

 the buff feathers. Iris grayish-brown, cere j^ellowish or olive-green, 



