. Elements of comparative zoology. Zoology. 254 SYSTEMATIC ZOOLOGY. a sting—a weapon of offence and defence, the efficiency of which is increased by an associated poison-gland. The lowest forms are the sawflies, the larvae of which are vegetable-feeders, some eating the leaves of plants, others boring in the solid wood. A little higher in the scale come the gall-flies, those forms which lay their eggs in various. Fig. 76.—Ichneumon-fly, enlarged. From Riley. plants and in some way so stimulate the vegetable tissue that strange growths—galls—are formed. Allied to these last are the ichneumon-fl
. Elements of comparative zoology. Zoology. 254 SYSTEMATIC ZOOLOGY. a sting—a weapon of offence and defence, the efficiency of which is increased by an associated poison-gland. The lowest forms are the sawflies, the larvae of which are vegetable-feeders, some eating the leaves of plants, others boring in the solid wood. A little higher in the scale come the gall-flies, those forms which lay their eggs in various. Fig. 76.—Ichneumon-fly, enlarged. From Riley. plants and in some way so stimulate the vegetable tissue that strange growths—galls—are formed. Allied to these last are the ichneumon-flies (fig. 76), which lay their eggs in other insects. Here the larvae hatch out, feed upon the host, at last destroying it. Then pupation comes, and. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
