. Nature-study; a manual for teachers and students. Nature study. Katydid. terminated by a stout, sharp beak, which is generally folded under the head. The compound eyes are prominent, as are also the three ocelh. The song of the ci- cada is produced in a pair of elaborate drum- like organs on the under side of the abdomen. Turn the insect over and a pair of circular covers will be seen just behind the hind legs. Lift these up and you will see a cavity under each. Across this cavity are stretched membranes which are made to vibrate by the rapid contraction and relaxation of attached muscles. T
. Nature-study; a manual for teachers and students. Nature study. Katydid. terminated by a stout, sharp beak, which is generally folded under the head. The compound eyes are prominent, as are also the three ocelh. The song of the ci- cada is produced in a pair of elaborate drum- like organs on the under side of the abdomen. Turn the insect over and a pair of circular covers will be seen just behind the hind legs. Lift these up and you will see a cavity under each. Across this cavity are stretched membranes which are made to vibrate by the rapid contraction and relaxation of attached muscles. The females have no such sounding apparatus and are therefore silent. If cicadas are found that have dropped from the trees they should be brought to the school alive and kept in cages. Feed them on succulent leaves. The development of the so-called seventeen-year cicada is interesting be- cause the larvas grow very slowly, taking from 13 to 17 years to mature. They live in the ground, feeding upon tender roots. The two-year cicada develops in two or three years. Cicadas have been famed in poetry ever since the times of Fig. 82. 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 Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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