486 



SWALLOWS. 



May. Nest in communities in holes of sand 

 banks; eggs, unspotted. Notes, a single 

 twitter. Flight, quite weak. 



551. ROUGH-WINGED SWALLOW. 



Differs from last in having throat 

 brown, fig. 384. Breeds in temperate N. A. 



Fig. 885 



Tree Swallow. 



from Central America north to southern 

 Conn., western Mass, and British Columbia; 

 winters in Central America; south in Sept., 

 north in May. Nests in holes of bridges, 

 banks, buildings, etc., seldom in communi- 

 ties. Note, a feeble twitter. Flight^ not 

 very strong. 



