Annual report of the Board of Regents of the Smithsonian Institution . o unhindered flight over openstretches of water. A review of the known Carboniferous insectsshows that these two types actually predominated, or almost exclu-sively made up the insect fauna of the forests and swamps of thattime. The insects of the first class consisted principally of roaches(fig. 1); those of the second class comprise dragon flies. May fly likeinsects, and insects of an extinct group kno\vn as the Paleodicty-optera (fig. 2 A). It is very doubtful, however, that the insectsknown from the Carboniferous rocks
Annual report of the Board of Regents of the Smithsonian Institution . o unhindered flight over openstretches of water. A review of the known Carboniferous insectsshows that these two types actually predominated, or almost exclu-sively made up the insect fauna of the forests and swamps of thattime. The insects of the first class consisted principally of roaches(fig. 1); those of the second class comprise dragon flies. May fly likeinsects, and insects of an extinct group kno\vn as the Paleodicty-optera (fig. 2 A). It is very doubtful, however, that the insectsknown from the Carboniferous rocks represent anything like thevariety of insect forms that existed at the time these rocks were laiddown, for there were large areas of open country on both continentswhere many species may have flourished whose remains have not beenpreserved. HOW INSECTS FLY SNODGEASS 385 The remarkable thing about the Carboniferous insects is not thatthey existed in great abundance at so remote a period, but that theydiffered comparatively little from modern insects. Of course, ento-.
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