. Laboratory problems in civic biology. Biology. 36 INTERRELATIONS OF PLANTS AND ANIMALS are not alone sufficient identification, as they may or may not be present. A jointed pro- boscis which points backwards is the only sure means of knowing this group. Beetles (Coleoptera, sheath wings).—• Characterized by having a strong front pair of wings called elytra, usually covering the hind wings and always meeting in a straight line down the middle of the back. Mouth parts hard, pincher-like a. Field Work Method. — Collect as many different kinds of insects as you can, making careful notes a
. Laboratory problems in civic biology. Biology. 36 INTERRELATIONS OF PLANTS AND ANIMALS are not alone sufficient identification, as they may or may not be present. A jointed pro- boscis which points backwards is the only sure means of knowing this group. Beetles (Coleoptera, sheath wings).—• Characterized by having a strong front pair of wings called elytra, usually covering the hind wings and always meeting in a straight line down the middle of the back. Mouth parts hard, pincher-like a. Field Work Method. — Collect as many different kinds of insects as you can, making careful notes as to the locality where the insect was found, the flowers which it frequents, the kind of food it was tak- ing from the flower, and the order to which it belongs. b. Laboratory Work Observations. — From boxes containing a number of different insects pick out one from each order given above and give your reasons for placing that particular insect in the order which you have chosen for it. Conclusion. — 1. Why do certain insects always frequent certain flowers ? Look at the insect, especially the mouth parts, verjr carefully and study the form of the flower before making your decision. 2. How would you pick out (a) a bee, (b) a butterfly, (c) a bug, (d) a grasshopper from the above insects? Problem 11: To study the life history (.metamorphosis') of an insect. NOTE. — Field work may be done at a museum, or questions may be worked out from some of the excellent preparations made by the Kny-Scheerer Company or other of the biological supply 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 Hunter, George William, 1873-1948. New York, Cincinnati [etc. ] American Book Company
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