. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. BROOK LIFE. 147 stone. In our common forms there is a tuft of hair- like tracheal gills just behind the base of each leg, and the more mature individuals have conspicuous wing-pads (Fig. 116). These general characteristics will enable the pupil to recognize these insects. Specimens should be collected and taken to school for a more careful study of their structure. Look also for empty nymph skins ; these will be found clinging to stones and othe
. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. BROOK LIFE. 147 stone. In our common forms there is a tuft of hair- like tracheal gills just behind the base of each leg, and the more mature individuals have conspicuous wing-pads (Fig. 116). These general characteristics will enable the pupil to recognize these insects. Specimens should be collected and taken to school for a more careful study of their structure. Look also for empty nymph skins ; these will be found clinging to stones and other ob- jects on the shores of the stream, where they were left when the adults emerged. Pin the empty nymph skins and preserve the nymphs in al- cohol. Put both in your collec- tion with the adult stone-flies (see page 103). In the study of the structure of these insects note the follow- ing : The nymphs resemble the adults to a consid- erable degree, except that they lack wings. The order Plecopiera, or stone-flies, is a good example of those orders, the members of which undergo an incomplete metamorphosis. The body is greatly flattened; in this way the insect is well fitted for creeping under stones. The legs are flattened and fringed with hairs, fitting the insect for swimming as well as for creeping. The tarsi are each furnished with two claws. The organs of special sense are well developed, there being large compound eyes, three simple eyes, and long antennae. The mouth is fur-. FlG. 116.—Nymph 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 Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. New York, D. Appleton and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomol, bookyear1901
