. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 254 ZOOLOGY. Tomato worm and cocoons of ichneumons, photograph by Overton. From structure, and can no longer work, but only fight. Some species go further and make slaves of the ants preyed upon. These slaves do all the work for their captors, even to making additions to their nest and acting as nurses to their young. The entire communal life of the ants seems to be based upon the perception of odor. If an ant of the same species but from a different nest be put into another colony, it will
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 254 ZOOLOGY. Tomato worm and cocoons of ichneumons, photograph by Overton. From structure, and can no longer work, but only fight. Some species go further and make slaves of the ants preyed upon. These slaves do all the work for their captors, even to making additions to their nest and acting as nurses to their young. The entire communal life of the ants seems to be based upon the perception of odor. If an ant of the same species but from a different nest be put into another colony, it will be set upon and either driven out or killed. Ants never really lose their com- munity odor; those absent for a long time, on returning, will be easily distinguished by their odor, and eagerly welcomed by the mem- bers of the nest. The talking of ants (when they stop each other, when away from the nest, to communicate) is evidently a process of smelling, for they caress each other with the antennae, the organs with which odors are perceived. Ichneumons. — One of the Hymenoptera (incorrectly called a fly), the ichneumon fly, is of considerable importance, because of its habit of laying its eggs and rearing the young in the bodies of cat- erpillars which are harm- ful to vegetation. Some of the ichneumons even bore into trees in order to de- posit their eggs in the larVSe Thalessa boring in an ash tree to deposit its of WOOd-borina; insects. It ^^^^ ^'^ *^^ burrow of a hom-tail larva, a wood borer. From photograph, natural IS safe to say that by the size, by Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George William, 1873-1948. New York, American book company
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