An associational study of Illinois sand prairie . tes are very abundant in sand regions, where theyare found under boards. They eat wood tissue, and logs in thev/oods are often found with most of the interior eaten out. Severalcolonies containing: 7/orkers, soldiers, and winged v/ere foundin April. They are common in the Lake Llichigan sand region andon the dry soils of Southern Illinois. Widely distributed. Order Hexa^enia bilineata Say, July 6. A dark colored may-fly of large size—wings clouded anddark in color. This is the most abundant may-fly in the river—willow—bugs—
An associational study of Illinois sand prairie . tes are very abundant in sand regions, where theyare found under boards. They eat wood tissue, and logs in thev/oods are often found with most of the interior eaten out. Severalcolonies containing: 7/orkers, soldiers, and winged v/ere foundin April. They are common in the Lake Llichigan sand region andon the dry soils of Southern Illinois. Widely distributed. Order Hexa^enia bilineata Say, July 6. A dark colored may-fly of large size—wings clouded anddark in color. This is the most abundant may-fly in the river—willow—bugs—the residents call them as the full-grov;n nymphscrav/l up on the trunks of the willov/s of the flooded bottoms tocast off the pupal skin and emerge as adults. The tree trunks areoften covered with these esvuviso. The adults fly actively aboutat ni^^ht; their numbers are so great that the heaps of dead v/illov/-bugs accumulated under the arc lights have had to be hauled av/ayin wagonloads. Several species of Ephemeridae are very numerous. in early sumrier at the Devils Hole; they prohahly form an ap-preciahle element in the food supply of predaceous insects. Hexa^enia variabilis Say, June 25. A rather large may-fly with yellov/ wings. Very oommonthroughout the sand-region in the hresding season. The larvaeare very numerous in the river. The adults are found as far asthree miles from the river. Order IHilUROPTERA Chrysopa oculata Say, August. The lace-v/inged fly, a common and widely distributedspecies. The larvae are knovm as aphis lions, .and roam abouton plants in search of plant-lice, from which the juices are ex-tracted by means of the mandibles. The eggs are laid on longstalks. ITo specimens were taken, though several were took it at the Devils Hole. Cryptoleon si^natum Hag. June to August, This species was seen, but no specimens were found it very common in different parts of the sand other Illinois records. The larvae of the Myr
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