. New elementary agriculture for rural and graded schools; an elementary text book dealing with the plants, insects, birds, weather, and animals of the farm . USEFUL INSECTS 65 kinds of other insects, but seem to like the grasshoppersbest. Some of these robber flies are as large as, andeven look very much like, bumble-bees. Lace-Wing Flies, or Aphis Lions.—The delicate,gauze-winged insects with golden eyes which will be calledto mind by the picture on this page are very usefulinsects, because they spend their lives among plant lice,upon which they feed. Both the full-grown and young. « ^ e Fig
. New elementary agriculture for rural and graded schools; an elementary text book dealing with the plants, insects, birds, weather, and animals of the farm . USEFUL INSECTS 65 kinds of other insects, but seem to like the grasshoppersbest. Some of these robber flies are as large as, andeven look very much like, bumble-bees. Lace-Wing Flies, or Aphis Lions.—The delicate,gauze-winged insects with golden eyes which will be calledto mind by the picture on this page are very usefulinsects, because they spend their lives among plant lice,upon which they feed. Both the full-grown and young. « ^ e Fig. 26. Lace-wing; eggs, larva, and fly. insects occupy their time doing this good work. Infact, so fierce are these little inoffensive-looking insectsthat nature has found it necessary to defend themagainst their own relatives. When their eggs are laidthey are placed on the end of hair-like stems, so that,when they hatch, the young larvae cannot get at and eatone another. Each one as it hatches drops off its perchand must wander off by itself in search of plant lice tosatisfy its keen appetite. Once among the lice its foodis plentiful and there is less danger of their eating oneanother. These aphis lions, or lace-wings, are rela-tives of the ant-lions, which dig in the sand and makelittle funnel-shaped pitfalls to draw down ants and otherwandering insects on which they feed. 66 NEW ELEMENTARY AGRICULTURE Tiger Beetles and Ground Beetles.—Not only do wefind that insects are attacked by other kinds which dartupon them while flying in the air or feeding on plants, orwhich lie
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