CLIFF SWALLOW 135 



ten days, namely, May 16 to 27. Usually 

 the visitant has not remained over to a 

 second day. But in 1905 the records indi- 

 cate that a female bird may have remained 

 from May 16 to 24, nine days, as one was 

 continuously present during that period. 

 The male birds usually sing. 



59. CLIFF SWALLOW 



Petrochelidon lunifrons 



The Cliff, or Eave, Swallow seldom comes 

 within the Garden. Twice the species has 

 been recorded. Four birds with a flock of 

 barn swallows were seen on May 16, 1905 ; 

 and two birds were present likewise with 

 barn swallows on May 30, 1907. 



The visits of the swallows usually occur 

 upon clouded and misty days. On such days 

 they may be seen skimming over the pond 

 in rapid flight. Thick weather seems to 

 attract them thither, while often in clear 

 weather no movement of a swallow within 

 the Garden will be seen. 



