Fig. 47.—Hemiptera. Anuraphis maidiradicis, the corn root aphid. The form at the left is the winged form; that at the right is the wingless form. All of the plant lice have these two forms. This species, as well as other kinds of plant lice, is frequently attended by ants, which feed on the honeydew produced by the aphids. Actual length less than 0.1 inch.
Members of one family, the Reduviidae or assassin bugs, prey on other insects. A few species called kissing bugs, some of them an inch long, occasionally attack people, inflicting an extremely painful bite and causing considerable bleeding.
Fig. 48.—Hemiptera. Aspidiotus perniciosus, the destructive San Jose scale. The scale is cut away on upper specimen to show insect proper beneath. Diameter less than 0.1 inch.
Fig. 49.—Hemiptera. Empoasca fabae, the potato leafhopper. This species is pale green. Some species are distinguished by bright red or yellow markings. Actual length about 0.1 inch.
Fig. 50.—Megaloptera. The larva of a species of Sialis, an alderfly. This form is aquatic. Actual length 0.7 inch.
Fig. 51.—Megaloptera. The adult of Sialis mohri, an alderfly. Other members of this order reach a length of 1 or 2 inches. They are mostly black, black and white, or mottled gray in color. Actual length 0.5 inch.