158 



KEY TO THE BIKDS OF EASTERN NORTH AMERICA. 



Group 3. Wing, over 7.50 inches long. 



Tail, pointed and rather long; under tail coverts, white. 



Tail, square ; under tail coverts, gray or bluish gray. 



Passenger Pigeon. 



Ectopistes miyratoriu*. 

 See No. 251. 



White-crowned Pigeon. 



Columba leucocephala. 

 See No. 250. 



FAMILY CATHARTIDyE. 



American Vultures. 



Plumage, black or dark brown ; hind toe, short ; claws, not sharp ; 

 head, bare in adult. 



Group 1. Wing from 14 to 21 inches long. 

 Section 1. Wing, less than 17 inches long. 



Head aud foreueck, bare; skin of head, blackish; general plumage, black; 

 primaries, hoary white beneath. 



Black Vulture. 

 Carrion Crow. 



Catharista nrubn. 

 See No. 260. 



