. Bulletin - United States National Museum. Science. COLLECTING AND PRESERVING TNSECTS—BANKS. 103 few months previous. Here one will usually find in the bark of the roots, stumps, main stems, tops, branches, and twigs different stages of many species of barkbeetles and bark-inhabiting larva?, together with their natural enemies and associates; and the wood will yield many more. Lumbering regions and sawmill yards are especially prolific in specimens at all times, as are also broken branches, individual trees, and groups injured or killed by insects, felled by storm, or otherwise rendered attra
. Bulletin - United States National Museum. Science. COLLECTING AND PRESERVING TNSECTS—BANKS. 103 few months previous. Here one will usually find in the bark of the roots, stumps, main stems, tops, branches, and twigs different stages of many species of barkbeetles and bark-inhabiting larva?, together with their natural enemies and associates; and the wood will yield many more. Lumbering regions and sawmill yards are especially prolific in specimens at all times, as are also broken branches, individual trees, and groups injured or killed by insects, felled by storm, or otherwise rendered attractive to insects. During the spring, summer, and fall the foliage will yield specimens almost unlim- ited in number and variety. But one should remember, as has already been indicated, that it is not the number and variety, but those of most im- portance that are to be sought out, noted, collected, and studied. It is often better to spend a day in the diligent search for all that can be found in or on a single tree, or in observing and recording in the notebook all that can be found out about a single species, than merely to collect hundreds of specimens or many species without careful records. Indeed, the proper recording of what one sees at the time the observations are made is of the greatest importance, and is the one thing the student should practice more, perhaps, than anything else. The collector should be constantly on the lookout for the natural enemies of the principal injurious species. One class of the enemies of insects consists of parasitic Hymenoptera, Diptera, etc., found in the adult, larval, or pupal stage, associated with their host, the larvae as external or internal feeders on the larva?, pupa?, or adults of the injurious species, and the adult parasites ovipositing on or in the victims, or in the bark or other infested parts of the plant. The insect enemies of the other class are predatory species of Coleoptera, Hemiptera, Hymenoptera, and other kinds of
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