. Economic entomology for the 2IO AJV ECONOMIC ENTOMOLOGY. Fig. 203. this applies as well to other species infesting tree-trunks,—^ the locust-borer,—is mechanical, the trunk being covered or coated by some material impenetrable, repellent, or destructive of or to the adults, thus preventing oviposition. The most satisfactory and lasting measure, all things considered, is cover- ing the lower portion of the trunk with wire mosquito-netting, tying at the top and hilling up against it at the bottom. The netting should extend at least two feet up the trunk and above that a coat of w
. Economic entomology for the 2IO AJV ECONOMIC ENTOMOLOGY. Fig. 203. this applies as well to other species infesting tree-trunks,—^ the locust-borer,—is mechanical, the trunk being covered or coated by some material impenetrable, repellent, or destructive of or to the adults, thus preventing oviposition. The most satisfactory and lasting measure, all things considered, is cover- ing the lower portion of the trunk with wire mosquito-netting, tying at the top and hilling up against it at the bottom. The netting should extend at least two feet up the trunk and above that a coat of whitewash should be maintained during the danger season. Other measures, equally useful here, have been already referred to when speaking of the '' flat-headed borers.'' In the genus Oncideres we find a curious and interesting egg- laying habit: the beetle lays an egg in a twig or branch, and then girdles it at a little distance below, eating so far through that a high wind brings it down. The twig wilts at once and the wood is then in the exact condition desired by the larva, which undergoes its transformations undisturbed by growth or undesired moisture. Sometimes shade-trees are attacked ; but merely gathering and burning the fallen wood keeps the insects in check. There are many other longicorns in our fauna, nearly six hundred species being listed in the catalogues, and many are beautiful as well as interesting. The few species referred to here do not even illustrate all the different types, but are all that are sufficiently injurious to be referred to at any length. Wooded regions furnish the greatest variety of species, and all portions of the trees furnish support for their larvae. The family ChrysomelidcB, or leaf-beedes, contains species that, in the main, feed upon leaf-tissue in the larval as well as adult stages, and many of them attack cultivated crops. The beetles may be distinguished by the tarsal structure already described, by their usually moderate or smal
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