Ross: The Dunesland Heritage of Illinois 



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Fig. 14. — The caddisfly Trianodes tarda Milne, one of the species living in the Dead River. 

 Above, adult insect. Below, tapering case made of bits of leaves; the front portion of the larva is 

 shown protruding from the open end of the case. The larva drags its case with it when it crawls 

 over submerged vegetation. 



that live only on meadowsweet, a species of sawfly that lives only on 

 horsetail, and a peculiar assemblage of northern caddisflies occurring 

 in the Dead River. These caddisflies, fig. 14, are aquatic insects whose 

 larvae make either portable cases or live in netlike retreats. When 

 full grown, the larvae transform into pupae that live either in the 



Fig. 15. — Dead River, Illinois Beach State Park. In this stretch of the river, case-making caddisfly 

 larvae abound. 



