THE wasps, bees, and ants, as well as the gall-flies, saw-flies, and a few other insects, are branches of the same family tree, being doubtless all descended from some common ancestral stock that flourished in long ago geological ages. They are classed by man in what he calls the Order Hymenoptera, or Order of Membrane-winged Insects, - a very misleading name, as other insects are quite as membrane-winged as these. The Hymenoptera resemble the general family of insects in possessing a distinct head, thorax, and abdomen, each of these parts having functions of its own.