864 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



browner, the proximal lesser wing-coverts brownish or dark brow^nish 

 gray instead of pale bluish gray; under parts (including under surface 

 of wing), bill, iris, and feet, as in adult male; length (skins), 170-197 

 (184); wing, 101-110 (106.2); tail, 60.5-68 (64.7); exposed culmen, 

 21-25 (23.2); tarsus, 20-23 (21.8); middle toe, 14-16.5 (15.4).« 



Immature male. — Similar to the adult female, but back and scapu- 

 lars light gray instead of brown, and hne of division between gray and 

 black on tail sharply defined (as in adult males). 



Young male (first plumage). — Similar to the immature male (as 

 described above) , but pale gray of upper parts much intermixed with 

 pure white (causing a mottled appearance), forehead white, black of 

 crown much intermixed with white (especially on median portion), 

 auricular, suborbital, and malar regions pale chestnut-brown, and 

 entire under parts pure white. 



Young female (first plumage). — Similar to the young male, but gray 

 of upper parts darker and tinged or suffused with brown, black of 

 pileum intermixed wdth pale gray and chestnut-brown (instead of 

 white), forehead strongly tinged with chestnut-brown, and whole 

 orbital, auricular, and malar regions deep chestnut-brown. 



Southeastern Mexico, in States of Vera Cruz (Playa Vicente; Buena 

 Vista; Pasa Nueva; Motzorongo; San Andreas Tuxtla), Oaxaca (Tux- 

 tepec). Tabasco (Teapa), Chiapas (Palenque), and Yucatan (Tizimin), 

 and southward through Guatemala (Peten; Choctum), British Hon- 

 duras (pine ridge near Manatee Lagoon), Honduras (Yaruca; San 

 Pedro; Rio Segovia), Nicaragua (Grey town; Rio Escondido), Costa 

 Rica (Bebedero; La Palma de Nicoj'a; Pigres; Pacuare; Rcventazon; 



« Eighteen specimens. 



Locality. 



MALES. 



Four adult males from State of Vera Cruz 



One adult mafe from Yucatan 



Seven adult males from Chiapas (1), Guatemala (3), British 



Honduras (2), and Honduras (1) 



Ten adult males from southern Honduras (1), Nicaragua 



(1), and Costa Rica (8) 



Four adult males from Panama 



FEMAI.E.S. 



Five adult females from Vera Cruz (4)and Oaxaca (1) 



Five adult females from Guatemala (4) and British Hon- 

 duras (1) 



Seven adult females from Nicaragua (3) and Costa Rica (4). 

 One adult male from Panama 



Wing. 



108.4 

 114 



04.9 

 67 



Ex- 

 posed 

 culmen. 



23.9 



22.9 

 23.2 



23.7 



23.5 



23 



21 



Tarsus. 



22.7 

 23 



21.9 

 21.4 



22.1 

 21.6 

 21 



Middle 

 toe. 



15.5 

 16.5 



1.5. 2 

 14.7 



15.6 

 1.5.1 



10 



I am unable to detect any differences of coloration between specimens from different 

 Central American and Mexican localities. 



