138 
ide, Hagenius, and the lower 4schnide) inhabit driftwood and 
submerged roots and brush. The second division comprises the 
heavier nymphs of the Libellulide, which usually sprawl upon 
the bottom or climb over fallen rubbish; and the third con- 
sists of the remaining Gomphide, the Cordulegasteride, and, 
to some extent, Libellula and its relatives, which occupy the 
mud or sand of the bottom. 
The species inhabiting submerged vegetation, constituting 
the first group, are of course most abundant in the quiet waters 
of slow streams, lakes, and ponds, where such growths have an 
opportunity to develop freely. The large and active nymphs 
of Tramea and Pantala appear to prefer the more exposed 
shores of large lakes and rivers.  Mesothemis collocata is 
adapted for life in the high temperatures of water from the hot 
springs of the west. The Agrionide and Anar are common 
everywhere in bodies of water with vegetation, from the small- 
est pool to considerable lakes. The other schnide climb on 
dead sticks and driftwood where there is little vegetation and 
food is not abundant, as in the bottom-land lakes and sloughs 
of the larger streams with good current, or (Boyeria) in the 
deeper holes along small streams, where projecting roots catch 
the floating driftwood. Hagenius also lives amongst driftwood 
and dead leaves in streams. The Calopterygide thrive in little 
rapid-flowing sandy rivulets like White Oak Run and Quiver 
Creek at Havana. 
In the second group, those living on the bottom,depth and 
current are important in determining the particular species 
likely to be found. LEpicordulia likes the deeper waters, as of 
the Illinois River itself or its deeper lakes, or the bottoms of 
the small lakes of northeastern Illinois, finding there the 
molluscan diet it enjoys. On the other hand Sympetrwm and 
Leucorhinia habit marshes and reedy shores, as well as shal- 
low weedy ponds and wet meadows. The * Pumpkin Patch” 
at Havana, the shores of Fourth Lake in northeastern [linois, 
and the swampy spots of the upland prairie, are situations of 
this character. Pachydiplax appears to like the deeper swamps 
