. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. CLASSIFICATION OF INSECTS. 55 are shown greatly enlarged in Fig. 24; they fre- quently occur in aquaria in which aquatic plants are growing. The sow-bugs (Fig. 25) are also Crustacea. They live about water-soaked wood : with these only one pair of antennas arc well developed. Class Arachnida (A-rach'ni-da). The Arachnids {A-rach!nids). To this class belong the spiders, scorpions, har- vestmen, mites, and certain other less common forms. These an
. Insect life; an introduction to nature study and a guide for teachers, students and others interested in out-of-door life. Entomology; Nature study. CLASSIFICATION OF INSECTS. 55 are shown greatly enlarged in Fig. 24; they fre- quently occur in aquaria in which aquatic plants are growing. The sow-bugs (Fig. 25) are also Crustacea. They live about water-soaked wood : with these only one pair of antennas arc well developed. Class Arachnida (A-rach'ni-da). The Arachnids {A-rach!nids). To this class belong the spiders, scorpions, har- vestmen, mites, and certain other less common forms. These animals differ from the other classes of the branch Arthropoda in having no antennas. They have four pairs of legs fitted for walking, and many of them have very large maxiilary palpi, which re- semble legs. The head and thorax are closely united, forming a region which is called the ceph- alothorax{ceph-a-lo-tho'rax). These characteristics are easily seen in spiders (Fig. 26). The most common rep- resentatives of the class Arach- nida are the spiders. These are extremely interesting ani- fig. 26.—a spider, mals on ac- count of the high development of their instinc- tive powers. An account of the habits of some of the common species is given in the chapter on Road- side 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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