1895] MARYLAND ACADEMY OF SCIENCES. 815 



Chordeiles virginianus (420). Nighthawk. 



About equally numerous and just as local as the Whip-poor- 

 will, from April 29 ('93, J. H. Fisher, Jr.) to October 15 ('92, 

 Blogg). At Washington, April 20 (Richmond). In fall, large 

 flocks migrating are noted from August 29 ('94) to September 

 25 ('92, Wholej). Nesting on the bare ground, this species has 

 discovered an excellent substitute in the flat roofs of the houses 

 of Baltimore City, where a large number breed. On June 8, 

 '91, one young bird a few days old was seen within stone's throw 

 of the City Hall, and on July 31, '94, two young birds were 

 flying after their parents. 



Family Micropodid.e — Swifts. 

 Chaetura pelagica (423). Chimney Swift. 



Common summer resident from April 16 ('91) to October 4 

 ('93); extreme dates are March 30 ('95, Blogg) and October 17 

 ('88, Resler); at Hagerstown, April 6 to October 16 ('80, 

 Small); at Cumberland, April 5 ('95, Z. Laney). 



On May 15 ('92) a pair were seen mating, but they were not 

 noticed breaking twigs until June 3 ('94) ; eggs were in nests 

 on June 19 ('81), and young birds fell down the chimney on 

 August 27 ('93). Sets are 2 of 5. 



Family Teochilid^ — Hummingbirds. 



Trochilus colubris (428). Ruby-throated Hummingbird. 



Common summer resident ; first noted at Washington on 

 April 28 (Richmond) and numerous around Baltimore from 

 May 1 ('92, Resler) to September 25 ('92); the latest date is 

 October 3 ('88, Resler), when one was perched on a telegraph 

 wire in the city, and ('90, Wholey) when one was taken. The 

 usual set of two eggs is noted from June 2 ('93, J. H. Fisher, 

 Jr.) to July 10 ('92, Blogg). 



