472 
VERTEBRATES IN THE VICINITY OF STATIONS XVII=XX. 
In the triangular piece of woodland, between the river and the 
open field, including within its borders Stations XVIII to XX, a 
number of vertebrate animals were observed. 
REPTILIA. 
A large garter-snake (Eutema sirtalis) was observed nicely 
tucked away between a large piece of ‘‘started’’ bark and the stump 
of an old tree. It was discovered while pulling the bark away in 
a search for mollusks. 
AVES. 
Birds were very plentiful in this area, and were as noted below: 
American Bittern. 
Great Blue Heron. 
Green Heron. 
Cuckoo; nesting. 
Flicker; nesting. 
Crow; nesting. 
Bronzed Grackle. 
Red-winged Blackbird. 
Blue Jay. 
Cowbird. 
Swamp Sparrow. 
White-throated Sparrow. 
Bobolink; nesting. 
Chewink. 
Catbird; nesting. 
Wood Thrush. 
Brown Thrasher; nesting. 
Robin. 
Bluebird. 
C..*EAST BRANCH OF THE CHICAGO RIVER, 
(StaTIONS XXI-XXIX.) 
STATION X XI, 
(Plates XVII.,2, and XVIII.,1.) 
As previously intimated, in the spring the river is quite wide and 
contains an abundance of water (Plate XVII.,2), but in the fall 
(Plate XVIII.,1) is reduced to a succession of elongated pools into 
