15 
animal life accumulate. Such are notatus and fraternus; 
while spiniceps prefers swifter flowing waters like Quiver Creek 
at Havana, or the upper Illinois River at Ottawa. 
In some species with which we have had but a limited 
experience further study may show a wider range of normal 
situations than that here assigned, but the preceding generali- 
zations should have a value to the student and collector, and 
may serve as a basis for a more exact account in future. 
The Illinois waters which afford the widest range of situa- 
tions and are most prolific in variety of dragon-fly nymphs are 
the small lakes of Lake county. Their shores are sometimes 
exposed, wave-washed, and rocky, and the life here found is 
remarkably like that of swift running water. Again, they are 
broad and marshy, and afford a home for Sympetrum. Out 
from shore we may find shallow waters with mats of aquatic 
vegetation, bare sandy-surfaces, or, at great depths, a bottom 
of soft mud. As to numerical abundance I have seen nothing 
in Illinois that can compare with the multitudes of dragon-flies 
that issue in favorable seasons from the broad shallow lakes 
along the Illinois River. 
ODONATA OF THE VARIOUS WATERS IN ILLINOIS. 
Taking the subject from a different point of view, we may 
briefly summarize the odonate life of the Illinois waters as fol- 
lows. 
In the larger rivers, down to the size of the Mackinaw, in 
places where the water flows with considerable current over a 
rocky bottom, Diastatomma may be looked for; where mud 
or sand bottom and quieter waters prevail, Epicordulia and 
some species of Gomphus may be found. Other species of 
Gomphus occur in the bare muddy or sandy bottoms of the 
sloughs and bottom-land lakes. In tree-shaded waters, where 
driftwood and branches have gathered, or along muddy margins, 
especially amongst exposed roots, the lower 4schnidw@ may be 
looked for. In bottom-land lakes where vegetation is abundant, 
one may find Anax, Agrionide, Mesothemis, Celithemis, Tramea, 
