. The Dunesland heritage of Illinois . Fig. 12.—Clump of bearberry on sand ridge near Zion, Illinois. The insect at the left is the bearberry leafhopper, Texananus cumulatus (actual length about three-eighths inch). the surrounding terrain, colonies of these northern species have per- sisted far south of their present continuous range to the north or northeast. A large number of these species are stoneflies and caddis- flies whose young live in the spring-fed streams occurring in these habitats. A northern caddisfly and a northeastern stonefly of this type occur at Lusk Creek, near Eddyville,
. The Dunesland heritage of Illinois . Fig. 12.—Clump of bearberry on sand ridge near Zion, Illinois. The insect at the left is the bearberry leafhopper, Texananus cumulatus (actual length about three-eighths inch). the surrounding terrain, colonies of these northern species have per- sisted far south of their present continuous range to the north or northeast. A large number of these species are stoneflies and caddis- flies whose young live in the spring-fed streams occurring in these habitats. A northern caddisfly and a northeastern stonefly of this type occur at Lusk Creek, near Eddyville, Pope County, in extreme southern Illinois. In the small stream at Rocky Branch, Clark County, in east-central Illinois, a peculiar relict stonefly persists. In the cold, spring-fed brooks in the Elgin Botanical Garden, in the city of Elgin, two kinds of stoneflies and four kinds of caddisflies persist 300 to 500 miles south or southwest of the main range of each species. These typically northern kinds of stoneflies and caddisflies are quite dif-
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