Excerpt from Bulletin of the United States Bureau of Fisheries, Vol. 38: 1921-1922 The insects belonging to the family Chiromidae, commonly kwn as midges, constitute an obscure group of Diptera which, on account of their small size and iffensive habits, have very largely escaped tice except as they may have been mistaken for mosquitoes, which they resemble only in general appearence. They are, however, very common in every community from the polar region to the Tropics. The adults are often seen on moist evenings flying in dense swarms near the ground, over sidewalks, or under trees by the roadside, and it is in this brief period of their existence, consisting of from 5 to 10 days, that they are most familiar to the general public. Closely related to the Chiromidae are the Orphnephilidae, a family of semiaquatic insects as scarce as the Chiromidae are common, the only kwn habitat in this country being in the environment of Ithaca, N. Y. The larval stages of the Chiromidae, which extend over a period varying from all winter to 25 or 30 days, according to food and weather conditions, are only infrequently observed, chiefly because of the small size and secluded habits of the larvae. They are aquatic, mainly fresh-water, insects living in burrows which they construct by fastening together the debris found at the bottom of ponds with silk secreted by their salivary glands. The great abundance of these larvae and their relation to other aquatic organisms were the fundamental considerations that gave impetus to this study. It was hoped that an investigation of their feeding habits would give a clue to the chief adaptations which have given rise to their numerical dominance and widespread distribution. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art techlogy to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.