. Annual report. Entomological Society of Ontario; Insect pests; Insects. Fig. 37.— (a) Head of Cabbage butter- fly, showing eye, long antennae and coiled sucking tube, (b) Head with sucking tube uncoiled. Fig. 38.—A Cabbage Worm, showing the yellowish band along the back, the breathing pores, and yellowish dots along the sides, the three pairs of true legs in front, the five pairs of prop-legs behind, and the hairs and black dots on the back. (Somewhat magnified.) Perhaps the most interesting structure of the butterfly is the long sucking tube which is usually coiled up like a watch spring, (
. Annual report. Entomological Society of Ontario; Insect pests; Insects. Fig. 37.— (a) Head of Cabbage butter- fly, showing eye, long antennae and coiled sucking tube, (b) Head with sucking tube uncoiled. Fig. 38.—A Cabbage Worm, showing the yellowish band along the back, the breathing pores, and yellowish dots along the sides, the three pairs of true legs in front, the five pairs of prop-legs behind, and the hairs and black dots on the back. (Somewhat magnified.) Perhaps the most interesting structure of the butterfly is the long sucking tube which is usually coiled up like a watch spring, (Fig. 37, a). Jf we observe a butterfly while on a visit to a flower, we shall find that the sucking-tube is uncoiled (Fig. 37, b) and thrust into the corolla, and that the nectar is sucked by means of little muscles acting on a bulb or sac at the base of the tube. The process resembles that by which wate^ is drawn up through a straw inserted in the mouth. The eggs are laid by the female butterfly on the plant which serves as food for the caterpillar. Pupils should look on the underside of the leaves of cabbage, turnip, rape, mignonette, and other cruciferous plants for the pale yellow, flask-shaped, erect bodies, and examine carefully with a lens to find the vertical ribs on the eggs. The teacher should direct attention to the fact that the eggs are seldom placed in clusters but are somewhat scattered. In about a week the tiny caterpillar comes out of the egg. (Note how long it takes to become full grown, and how often it moults). The color is green like its food-plant. All should examine carefully and find the yellowish band along the top of its back, the row of yellow spots along the sides and the fine black dots on its body. When full grown the caterpillar is nearly an inch in length. (Fig. 38). Then there are indications that another change is about to take place. (What are some of these indications 1 Where do you generally find the chrysalids ?) Very frequently in the
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
