64 
BIRDS OF PENNSYLVANIA. 
think, as a rule, they usually prefer to remain by themselves during* the 
season of reproduction as well as at other times. Various writers state 
that the egg-s are four in number. I have examined many nests, and 
consider the usual complement to be not less than five ; frequently six 
eggs are laid. The eggs are pale-blue and larger than those of our com- 
mon pigeon. This species feeds much more frequently on insects than 
other of the herons that reside with us. Nuttall writes of the Green 
Heron in the following language : ‘‘ He is also particularly attracted by 
artificial ponds for fish, not refraining even to visit gardens and domes- 
tic premises which any prospect of fare may offer. He is, at the same 
time, perhaps as much in quest of the natural enemy of the fish, the 
frog, as of the legitimate tenants of the pond. These bold and intrusive 
visits are commonly made early in the morning, or towards twilight, and 
he not unfrequently, when pressed by hunger, or after ill-success, turns 
out to hunt his fare by day as well as dusk, and, at such times, collects 
various larvae, particularly those of the dragon-fiy, with grasshoppers 
and different kinds of insects. At other times he preys upon small fish, 
crabs and frogs, for which he often lies patiently in wait till they reap- 
pear from their hiding places in the water or mud, and on being trans- 
fixed and caught, which is effected with great dexterity, they are com- 
monly beaten to death, if large, and afterwards swallowed at leisure.” 
Fourteen birds, examined by me, were found to have fed on the differ- 
ent materials named below : 
No. 
Date. 
Locaettv. 
Food-Materials. 
1 
June — , 1879, 
Barnegat. N. .1 
Beetles and other insects. 
2 
Oct. 10. 1879 
Chester county. Pa 
■ ' Fall-fish.” 
3 
April 29. 1880 
Chester countv. Pa 
Frog and minnows. 
4 
April 29, 1879,- 
Chester county. Pa 
BTagments of insects and small quantity of 
hair, probably that of a field-mouse. 
5 
May 12, 1880 
Chester county. Pa 
Beetles. 
t; 
July 3. 1880 
Delaware county. Pa. . . . 
Frog. 
7 
June 30. 1881 
Chester county. Pa 
Remains of small fishes. 
8 
Aug. 17, 1881 
Chestercounty, Pa 
Beetles and other insects. 
9 
May 14, 1882, 
Lancaster county. Pa. . . . 
Fishes and frogs. 
10 
July 29, 1882 
Chestercounty, Pa.. .... 
Remains of small fishes. * 
11 
July 29, 1882 
Chestercounty, Pa 
Remains of small fishes. * 
12 
July 29, 1882 
Chestercounty. Pa 
Remains of small fishes.* 
13 
July 29, 1882 
Chestercounty. Pa 
Remains of small fishes. * 
14 
Sept. 4, 1883 
York county, Pa 
Dipterous and other insects. 
* Four young birds taken from the nest. 
Genus NYCTICORAX Stephens. 
Nycticorax nycticorax naevius (Bonn.). 
Black-crowned Night Heron ; Squawk ; Night-hen. 
Description {Plate 6). 
Bill very stout and thick ; maxilla slightly curved ; bill and tarsus each about 3 
inches long ; head and neck large, the latter quite short ; body rather short and 
heavy. 
Adult. — Length about 25 inches ; alar extent, about 44 ; bill black ; lores greenish- 
yellow ; eyes red ; legs yellowish ; top of head and middle of back glossy-greenish 
