1895] MARYLAND ACADEMY OF SCIENCES. 315° 
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, Wholey). 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 Micropopipz—Swifts. 
Cheetura 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 Troca1Lipa2—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 (793, J. H. Fisher, 
Jr.) to July 10 (92, Blogg). 
