. Bulletin. Natural history; Natural history. PRISON: STONEFLIES, OR PLECOPTERA, OF ILLINOIS 293 where the river bed is rocky, or in rapids below dams, such as exists at Homer, i\g. 11, Oregon and Sterling, Illinois. Acroneuria rur-alis, on the other hand, is usually found in trash in deeper water having less current. Many species, such as Hydropci-la crosbyi, Taenioptcryx nivalis, Iso- perla conjusa and \arious species of AUocapnin, congregate in masses of leaves which lodge against rocks or vegetation growing in or protruding from the water, fig. 14. These same species also frequent the shal
. Bulletin. Natural history; Natural history. PRISON: STONEFLIES, OR PLECOPTERA, OF ILLINOIS 293 where the river bed is rocky, or in rapids below dams, such as exists at Homer, i\g. 11, Oregon and Sterling, Illinois. Acroneuria rur-alis, on the other hand, is usually found in trash in deeper water having less current. Many species, such as Hydropci-la crosbyi, Taenioptcryx nivalis, Iso- perla conjusa and \arious species of AUocapnin, congregate in masses of leaves which lodge against rocks or vegetation growing in or protruding from the water, fig. 14. These same species also frequent the shallow margins of streams where they hide under the leaves which collect in the. Fig. 13.—Typical medium sized stream habitat of Illinois stoneflies. At such places along the Embarrass near Charleston and in similar streams through- out the state, Acroneuria internatn, Pteronarcys nobilis and Hydroperhi crosbyi are to be found. water along the banks. The nymphs of Ferlesta placida and Neoperla dyniene exhibit in my experience a preference for hiding away in the algae and other forms of aquatic vegetation growing on and among the rocks in fairly rapid water. The t\'pe of bottom of a stream, as already indicated in what has been said regarding certain species, is an important factor in governing the concentrations of different species of stonefly nymphs, hoperla decepta and hoperla inohri have been found only in small streams with a con- siderable amount of sand bottom and hoperla iiiinuta in abundance only in small streams rich in organic matter and with muddy bottoms. From the standpoint of habitat preferences the adults of stoneflies are less noteworthy than the nymphs because of their restricted life span and type of activities. The adults are usually found close to the waters in which the nymphs develop but at times fly considerable distances away from water. The nocturnal forms are frequently attracted to lights. The egg laying habits of the adult females do have a direct be
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