Research Items

Abstract

Caddis Flies of Illinois A WELL-PRODUCED monograph on the Trichoptera of Illinois forms the subject of Article 1 of Vol. 23 of the Barile of the Illinois Natural History Survey. The a Herbert H. Ross, mentions that some 18A of these insects are known from the State of and that the immature stages of no fewer than a hundred and twenty of the species are treated in this work. A considerable number of the species are described as new, and it is estimated that about three-quarters of a million specimens were actually collected and examined. Many of them were either females or larvæ, and consequently could not be identified any further than their genera. Keys are given for the identification of the larvae, pupae and adults of the seventeen families of caddis flies that are represented in North America. The monograph is very fully illustrated by more than a thousand separate figures of structural details which are clearly represented and greatly enhance the value of the work for purposes of identification. At the end of the monograph there is a useful check list of the Trichoptera of the nearctic zoological region. The whole treatise forms an admirable introduction to the study of these insects in North America, and is also likely to be useful to students of the European species.