228 MEMOIRS OF THE NUTTALL ORNITHOLOGICAL CLUB. 



i8i [420] Chordeiles virginianus (Gmel.). 



NiGHTHAWK. 



Not uncommon summer resident, common transient visitor ; May 1 5 to 

 October 6. 



In May, and again in late August and September, it is not uncommon to 

 see flights of from ten to forty or more of these birds, pausing at times to course 

 about the fresh or salt marshes. 



They are found commonly in the cities of the County where they nest on 

 the flat roofs of houses, an interesting case of adaptation to changing environ- 

 ment. 



182 [423] Chsetura pelagica (Linn.). 

 Chimney Swift. 



Common summer resident; April 28 to September 21 ; average date of 

 arrival for nine years, May 4. 



Eggs: June. 



Mr. S. P. Fowler,' of Danvers, stated in i860, that " Chimney Swallows 

 have become very abundant. I can distinctly remember when they were rarely 

 seen." 



The Chimney Swifts had a hard time in the prolonged June storm of 1903, 

 and, in 1904, the Swifts were evidently diminished in numbers. 



183 [428] Trochilus colubris Linn. 



RUBY-THROATED HUMMINGBIRD. 



Common summer resident ; May 9 to September. 



Eggs : May 30 to June 15. 



One day in August, when watching for shore birds from a blind on the 



IS. P. Fowler: Proc. Essex Inst., vol. 3, p. 35, 1864. 



