20 FIELD KEY TO THE LAND BIRDS. 
3%. NIGHT-HAWK. BULLBAT. Chordeiles 
virginianus. — Length, 10 inches. Resembles the 
whippoorwill in a general way, but may always easily 
be recognized by a broad white patch on the wing. 
He flies high in the air, catching insects and manceuy- 
ring like a bat. He is rarely seen in the daytime, 
when he sleeps, perched lengthwise on the limb of an 
old tree, and so closely matching the bark and lichens 
that it is difficult to distinguish him even when you 
know him to be there. 
38. CHIMNEY SWALLOW. SWIFT. Chae- 
tura pelagica. — Length, 5$ inches. Dark brown, 
lighter on the throat; black around the eye; tail- 
feathers stiff and pointed. In every way like a swal- 
low in appearance, but for some structural points 
placed here. The Chimney Swallow nests in chim- 
neys and in hollow trees. He may be observed sail- 
ing swiftly high in air, or flying above an unused 
chimney, suddenly stopping like a shot and dropping 
in. He flies only in the daytime, and is a common 
summer bird, wintering South. 
HUMIIING=BIRDS. — Trochilidae. 
Bos Bini. — Long and slender, mouth small. 
Fret. — Small. 
Foop. — Honey and insects. 
39. RUBY-THROATED HUMMING-BIRD. 
Trochilus colubris. — Length, 34 inches. Blackish 
above, with a green-gold shine; wings and tail with 
a purplish shine; underparts white; ruby red on 
throat. Females and young similar, but without the 
red throat. The Ruby-throat resembles a Hawk-moth 
in his ways, hovering from flower to flower, thrusting 
in his long bill, and then darting like a shot to some 
favorite bare branch for a few minutes’ rest. Peach- 
tree blossoms and lilies seem to be his favorite flowers. 
A summer bird. 
