. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois a hymenopterous parasite, Hemiteles b'tan- nulatus Gravenhorst, from cases of Limne- philus indivisus from Itasca Park, Minne- sota. In Europe the hymenopterous para- site Agriotypus has been reared from caddis fly larvae. HABITAT PREFERENCE Over most of Illinois, caddis fly habitats are streams and rivers with medium to slow current, with fairly warm water and fre- quently with a heavy silt deposit. This statement applies not only to the main water arteries but also to most of the small creeks and branch
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois a hymenopterous parasite, Hemiteles b'tan- nulatus Gravenhorst, from cases of Limne- philus indivisus from Itasca Park, Minne- sota. In Europe the hymenopterous para- site Agriotypus has been reared from caddis fly larvae. HABITAT PREFERENCE Over most of Illinois, caddis fly habitats are streams and rivers with medium to slow current, with fairly warm water and fre- quently with a heavy silt deposit. This statement applies not only to the main water arteries but also to most of the small creeks and branches which feed them. These streams run through the highly developed agricultural area which includes most of the state. Markedly different types of streams are either restricted to small areas such as the Ozark Hills, or very locally distributed, as for example, the spring-fed brooks at Elgin. In Illinois, natural lakes are restricted to the northeastern corner of the state and are all of glacial origin. Here are found a few typical lake species but they do not form a large proportion of our caddis fly fauna. Artificial lakes are common over most of the state but have few caddis flies. Typical Large Rivers The Mississippi, Illinois and Wabash are in some respects typical not only of our large rivers but also of the more sluggish lower portions of smaller ones such as the Fox and Kaskaskia. These have enormous numbers of the net-spinning caddis flies, especially Potamyia flava, Cheumatopsyche campyla and Hydropsyche orris, b'tdens and simulans. The case-making species are con- fined almost entirely to the Leptoceridae, and those taken in abundance include Oece- tis inconspicua and avara, Athripsodes can- cellatus and transversus, and Leptocella Can- dida, exquisita and diarina. Abundant web- spinning forms include Neureclipsis crepus- cularis and Cyrnellus niarginalis. In these situations there are generally few or no very early season species. Most of the species occur in the ad
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