16 
and Pantala amongst the vegetation, the latter two especially 
on more exposed shores; and Tetragoneuria, Libellula, Epicordu- 
lia, and Leucorhinia on the bottom underneath. If the situation 
is inclined to be marshy, Pachydiplax, Perithemis, and Celi- 
themis will be scattered over the bottom; and the shallowest 
and most temporary waters or wet lands are the especial home 
of Sympetrum. 
In the smaller and quicker flowing streams, like the upper 
Mackinaw and Sangamon, quite a different series occurs: Ha- 
genius, clinging to stones and driftwood and amongst dead 
leaves; Boyeria and other dark £schnide on submerged 
branches, roots, and sticks; Cordulegaster and the long-legged 
Macromia hidden at the bottom in sheltered eddies; Somato- 
chlora; and, finally, Progomphus, Dromogomphus, and certain 
species of Gomphus burrowing in the sandy bottom. In the 
prairie ponds and slow streams and ditches, Anar, Agrionide, 
and Mesothemis and other Libellulide occur amongst vegetation, 
and Sympetrum in shallower parts, while Libellula and Plathe- 
mis will be found where there is more mud and less vegetation, 
as in ditches and tile ponds, resting at the lower ends of well- 
defined tracks. In streams of rapid flow, but not especially 
rocky or shaded, the Calopterygide are most likely to be found, 
the imagos fluttering along the banks. 
In the small northern glacial lakes of [llnois, a remarka- 
bly varied odonate life can be found. Among the vegetation 
and along shore, Agrionide, Anax, Tramea, Leucorhinia, Li- 
bellula, Tetragoneuria, Epicordulia, and Basieschna may be taken. 
Sympetrum has been found along the broader, shallow, reedy 
margins. On the sparsely grown flats, in somewhat deeper 
water, Gomphus graslinellus, spicatus, and pallidus occur, and, 
especially where it is clayey, the Synthemiinwe—Didymops and 
Macromia—have been taken. On the other hand, Mesothemis, 
Pachydiplax, and Perithemis, elsewhere abundant, do not appear 
in our collections from these waters. 
As to the imagos, they are most likely to be found along 
the shores of waters inhabited by their nymphs, though many 
