4sn 



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. 88;") 



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. 



