. Elementary entomology . FIG. 169. The bittersweet tree-hopper (Enchenopa binotata Say). Adult (side and back views) and egg mass. (Much enlarged) (After Lugger) their egg laying. The different broods have been carefully mapped, so that it is possible to foretell the appearance in any given locality where the insect Plant-hoppers. The next three families may be grouped together under the term "plant-hoppers," as they jump off suddenly when disturbed. They are small insects, usually not over one fourth of an inch long, and suck the sap from the leaves and stems of their food
. Elementary entomology . FIG. 169. The bittersweet tree-hopper (Enchenopa binotata Say). Adult (side and back views) and egg mass. (Much enlarged) (After Lugger) their egg laying. The different broods have been carefully mapped, so that it is possible to foretell the appearance in any given locality where the insect Plant-hoppers. The next three families may be grouped together under the term "plant-hoppers," as they jump off suddenly when disturbed. They are small insects, usually not over one fourth of an inch long, and suck the sap from the leaves and stems of their food plants. The tree-hoppers (Mem- bracidae) have been called the ' brownie insects," for their bi- zarre shapes are often comically grotesque. The prothorax is prolonged back over the abdomen and is often produced forward or up- ward into horns or crests, as shown in Fig. 169. One of the most common species is the buffalo tree-hopper (Ceres a bubalns], which lays its eggs in the stems of weeds and young fruit trees, causing large knotty scars on the twigs. Another small brown species (Enchenopa binotata} is common on the bittersweet vine, the projecting prothorax looking exactly like a thorn on the stem. Few species of this family are sufficiently numerous to do serious damage. Here and there on weeds, grass, and tree foliage will be found a little mass of froth, within which may be found a small nymph, which is busily pumping the sap out of the plant, thus causing the froth which was formerly supposed to be voided by tree frogs and was termed ' ' frog spittle,"
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