. Elementary entomology. Insects. GROWTH AND TRANSFORMATIONS OF INSECTS 47 growth of the grasshopper, on the other hand, is gradual and presents no striking changes, and is known as an incomplete metamorphosis. Growth. The hard, chitinous skin which serves the insect as an outer skeleton has already been described, and furnishes an obvi- ous obstacle to its rapid growth. When the insect has grown to the limit of this outer shell, its predicament is solved in the only possible way, by the skin splitting down the middle of the back and being sloughed off, while the new skin formed beneath the ol
. Elementary entomology. Insects. GROWTH AND TRANSFORMATIONS OF INSECTS 47 growth of the grasshopper, on the other hand, is gradual and presents no striking changes, and is known as an incomplete metamorphosis. Growth. The hard, chitinous skin which serves the insect as an outer skeleton has already been described, and furnishes an obvi- ous obstacle to its rapid growth. When the insect has grown to the limit of this outer shell, its predicament is solved in the only possible way, by the skin splitting down the middle of the back and being sloughed off, while the new skin formed beneath the old one allows further. Nymph Of lubber gra growth. This process, reticnlata}; similar to the adult (Fig. 105) in general ' form, except in lacking wings Called molting, OCCUrs in all insects, as well as among other Arthropods, the skin being usually shed some four or five times during growth, though some species molt from ten to twenty times. j Incomplete metamorphosis. Young insects which resemble the adults, as those of the grasshopper, are termed nymphs. After the sec- ond or third molt, small wing pads appear on the back, becoming much larger with the fourth molt, and upon the fifth molt the adult FlG- 58- A typical larva, the cotton bollworm or corn-ear worm; totally unlike the adult winged insect emerges, to moth in form feed and reproduce. Complete metamorphosis. The caterpillar, maggot, or grub bear- ing no resemblance to its parents is called a larva. The larva grows and molts several times, and although its new clothes are sometimes of a different color, they are all cut on the same pattern, and there is usually no marked change in shape or structure until the larva is full grown. Upon reaching its growth the larva molts for the last time and transforms into a pupa. The pupa is a dormant. 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 p
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