Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] THE CLASSIFICATION OF INSECTS 167 one family, the Sialida, of which the large dobson-fly or hell- grammite is the best known species, are passed in the water of streams or ponds, but the members of all the other families are terrestrial through all their life. Of these the ant-lions, whose larvae make small pits in loose soil in which to catch prey, and the aphis-lions, lace-winged flies and snake-flies, whose sharp-jawed larvae feed on such small defenseless i
Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] THE CLASSIFICATION OF INSECTS 167 one family, the Sialida, of which the large dobson-fly or hell- grammite is the best known species, are passed in the water of streams or ponds, but the members of all the other families are terrestrial through all their life. Of these the ant-lions, whose larvae make small pits in loose soil in which to catch prey, and the aphis-lions, lace-winged flies and snake-flies, whose sharp-jawed larvae feed on such small defenseless in- sects as aphids and codling moth larvae, are more or less famil- iar and may be counted as beneficial insects. There are no seriously injurious insects in the order. ': FIG. 78.—Pit of ant-lion, and, in lower right-hand corner, pupal sand- cocoon, from which adult has issued, of ant-lion, Mynnclcon sp. (About natural size.) Order Mecoptera.—The order Mecoptera includes a few little-known insects called snow-fleas and scorpion-flies. The mouth-parts are of biting type, and are elongated to form a sort of short, blunt beak. The metamorphosis is complete. Most of these insects are probably predaceous in habit, feeding on other small insects, and thus perhaps doing good, but some take only animal food found dead. The curious snow-fleas, Boreus, are minute, black, leaping creatures that appear on snow in winter time, and in summer live on tree trunks or in
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