Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] INSECTS 231 ness. Frequent mention has been made of damage wrought by them in the early history of this country. In recent times, the damage has been appalling, especially in the central West. In 1874-1876 the damage to crops by the Rocky Mountain locust has been estimated at $200,000,000. At certain times, these locusts migrate from Colorado, Wyoming, and Dakota, where they breed during the summer, and descend in countless millions
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] INSECTS 231 ness. Frequent mention has been made of damage wrought by them in the early history of this country. In recent times, the damage has been appalling, especially in the central West. In 1874-1876 the damage to crops by the Rocky Mountain locust has been estimated at $200,000,000. At certain times, these locusts migrate from Colorado, Wyoming, and Dakota, where they breed during the summer, and descend in countless millions upon the grain fields to the eastward. Fortunately these invasions have been rare. Relatives of the Locust. — One member of this group that we associate with the grasshopper is the cricket. In structure and life habits it resembles the locust. Crickets live most of the time under logs or stones, and seem to prefer darkness to light. The cheerful chirp of the male house cricket is made by rubbing the thickened edge of one wing against a rasplike projection on the opposite wing. The rate of the chirp seems to depend upon the temperature of the sur- rounding air. Another musi- cian known to all is the katy- did. This insect, with its green body and wings, can scarcely be distinguished from the leaves on which it rests. This affords the katydid immunity from attack by many enemies. The protection thus received illustrates what is called protec- tive resemblance. The walking stick, which resembles the twigs on which it is found, and the walking leaf insect of the tropics, are other ex- amples of protective resem- blance. The mantis, shown in the illustration on the following page, is provided with strongly built forelegs, with which it seizes and The walking stick on twig, showing protective resemblance.
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