156 ILLINOIS ACADEMY OF SCIENCH 
Amphipods, Odonata larve, and a host of aquatic and semi- 
aquatic insect larve and adults, are in abundance. It is a melt- 
ing point of terrestrial and aquatic conditions, and the aquatic 
forms must endure much dessication when the waters dry up 
in late Summer. Numerous birds come here to find food. 
Champaign Co. This county is at the divide between the 
Sangamon, Vermilion and Embarass Rivers. Champaign and 
Urbana are almost the highest portions of the county. The 
woods are nearly all cleared and pastured, and the few that re- 
main, even if undisturbed by axe or stock, are more or less ab- 
normal due to the inroads of great numbers of field mice and 
shrews during Winter when the adjoining corn fields no longer 
suit them. This destruction of our forests, and as a conse- 
quence the development of corn and grain fields, means the 
destruction of our larger land snail habitats, and it is only a 
question of brief time, if not actually now, when these large 
Polygyras will no longer be collected by the hundreds. This 
fact should inspire students to survey those counties of Illinois 
from which we have few or no records, counties which are so 
situated that they are still rich in natural abodes, undisturbed 
by man. 
The Brownfield and Cottonwood Woods are located 314 and, 
4 miles respectively, to the Northeast of Urbana. Their area 
is about eighty acres each. Until 1910 the only intruders in 
the Brownfield Woods (also called Augerville Woods), were 
rabbit hunters, botanists and entomologists. Since then, 
church picnics were held there, and more or less of a habit, 
fires were built and the burning embers not always ex- 
tinguished, hogs and chickens entered, and trees were cut 
down by the neighbors. The Brownfield Woods is in the main 
part well drained, is composed chiefly of a mesophytic plant 
association, with a small sample of wet lowland type near the 
intermittant creek which flows thru the woods. The fauna of 
this creek is very poorly developed. 
The mollusca of these woods are quite well developed; the 
following species have been collected: Polygyra elevata, P. 
zaleta, P. pennsylvanica, P. thyroides, P. hirsuta, Circinaria 
concava, Zonitoides arboreus, Z. mimusculus, Z. nitudus, 
