. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 20 HOW INSECTS TRANSFORM to a " chrysalis " or pupa. And finally, from the pupa emerges the winged butterflj^, ready to begin the hfe round over again. This is an example of complete metamorphosis, including four distinct stages — egg, larva, pupa, and adult. With the squash bug we find the adult laying an egg, as before. But from tliis egg hatches, not a larva or worm, but a tiny, active bug,. Fig. 17. — Illustrating incomplete metamorphosis. Eggs, nymphs, and adult of the Squash Bug, A?Msa tristis
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 20 HOW INSECTS TRANSFORM to a " chrysalis " or pupa. And finally, from the pupa emerges the winged butterflj^, ready to begin the hfe round over again. This is an example of complete metamorphosis, including four distinct stages — egg, larva, pupa, and adult. With the squash bug we find the adult laying an egg, as before. But from tliis egg hatches, not a larva or worm, but a tiny, active bug,. Fig. 17. — Illustrating incomplete metamorphosis. Eggs, nymphs, and adult of the Squash Bug, A?Msa tristis De G. Original. similar to the parent insect except that it has no wings. This immature form grows, shedding its skin four or five times, and finally with the last moult acquires its wings and is now a t.^-pical adult. The imma- ture stage is known as a nymph, and this is an example of incomplete metamorphosis, including only three distinct stages instead of four — egg, nymph, and adult. In all insects the larval or nymph stage is tlie period of 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 O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
