16 



and Fanfafa amongst the vegetation, the latter two especially 

 on more exposed shores ; and Tefrar/oneuria, Libpllida, Epicordu- 

 lla, and Leucorliinia on the bottom underneath. If the situation 

 is inclined to be marshy, PdvlijidipJax, Periflipuih, and Celi- 

 thenus will be scattered over the bottom ; and the shallowest 

 and most temporary waters or wet lands are the especial home 

 of Si/nipetrHDi. 



In the smaller and quicker flowing streams, like the upper 

 Mackinaw and Sangamon, quite a different series occurs: Ha- 

 geuius, clinging to stones and driftwood and amongst dead 

 leaves; Boijeria and other dark yEschnidit on submerged 

 branches, roots, and sticks ; Cordulegasfer and the long-legged 

 Macfomia hidden at the bottom in sheltered eddies ; Soniafo- 

 chlora ; and, finally, Progomplius, Dromogomphus, and certain 

 species of (ronipJnis burrowing in the sandy bottom. In the 

 prairie ponds and slow streams and ditches, Anax, Agrionid(e, 

 and Mesothetn'iH and other L/bpfIn/idf(' occur amongst vegetation, 

 and Si/Dfpefnnn in shallower parts, while LibcIlKla and Plaflw- 

 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 Calopfcri/gidfc are most likely to be found, 

 the images fluttering along the banks. 



In the small northern glacial lakes of Illinois, a remarka- 

 bly varied odonate life can be found. Among the vegetation 

 and along shore, Agrioiiidfe, Aua.r, Tramea, LeucorJiinia, Li- 

 belliila, Tcfragoiienrid, Epicordiffia, n^nd Basi resell na may be taken. 

 SympefrHm has been found along the broader, shallow, reedy 

 margins. On the sparsely grown flats, in somewhat deeper 

 water, Gomphus graslincUus, spic<(tas, and paUidus occur, and, 

 especially where it is clayey, the Sijyithemlince — Didymops and 

 jWirroinia — have been taken. On the other hand, Mesofhenus, 

 PficlnjdipjJd.r, and Perifhrniis, 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 



