Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] INSECTS 233 carriers they are of im- portance. Notice the large compound eyes at the side of the head, as in the grasshopper. The antennae, sensory organs which have to do with hearing and smelhng, are knobbed at the ends. The hairs which cover the body are modified on the wings to form scales. Some of these hairs have to do with the sense of touch. The Senses. — Experi- ments may easily be made outdoors in the fall of the year to d
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] INSECTS 233 carriers they are of im- portance. Notice the large compound eyes at the side of the head, as in the grasshopper. The antennae, sensory organs which have to do with hearing and smelhng, are knobbed at the ends. The hairs which cover the body are modified on the wings to form scales. Some of these hairs have to do with the sense of touch. The Senses. — Experi- ments may easily be made outdoors in the fall of the year to determine if the butterfly can distinguish color. Make careful note of the different flowers visited by a butterfly dur- ing a given period of time. Are flowers of certain colors visited during that time ? Experiments may also be made to see if the odors of flowers are fac- tors which determine the insects' visits. In most insects the sense of smell is better developed than that of sight. In most Monarch butterfly; adults, larva, and pupa on milkweed. From photograph loaned by the American Museum of Natural History. butterflies the antennae contain the sense cells which have to do with odor; in some male butterflies, however, a pouch on the wing serves as a help in distinguishing the presence of nectar in a flower. Make a drawing of the butterfly, showing as many as possible of the structures mentioned. Carefully label each part. A drawing of the head as seen from the side, enlarged about four times, will be useful. The monarch or milkweed butterfly (Anosia plexippus) is one of our com- monest insects. Its orange-brown, black- veined wings are familiar to every boy or girl who has been outdoors in the coun- tiy during the fall months. The adult female lays her eggs in the late spring on the milkweed. The eggs are fastened singly to the under side of milkweed
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