. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. 1908 ENTOMOLOGICAL SOCIETY. 143 purple of its upper surface is banded with pure white and adorned with orange suots and blue crescents. The larvse of these lovely butterflies feed upon the elm, willow, etc., and they do little, if any, harm. But we must not dwell upon the inoffensive insects, however beautiful. Let me draw your attention for a moment to creatures that work in darkness, to the iniury of the trees. Some of these belong" to the Hymenoptera : Tre- mex columba, Drury (Fig. 41); Uro
. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. 1908 ENTOMOLOGICAL SOCIETY. 143 purple of its upper surface is banded with pure white and adorned with orange suots and blue crescents. The larvse of these lovely butterflies feed upon the elm, willow, etc., and they do little, if any, harm. But we must not dwell upon the inoffensive insects, however beautiful. Let me draw your attention for a moment to creatures that work in darkness, to the iniury of the trees. Some of these belong" to the Hymenoptera : Tre- mex columba, Drury (Fig. 41); Uroceros alhicornis, Fabricius; U. cyaneus, Fabricius; U. flavicornis, Fabricius. They are large, handsome, but for- midable looking flies. Their larvae tunnel in various trees and do much damage. Fortunately their number are kept down by several species of even more dangerous-looking ichneumons : Thalessa atrata, Fab.; T. lunator, Fab.; T. nortont, Cresson, &c. The larvae of these follow up the larvae of the others and devour them. Many a tragedy, that we know not of, is done in the Fig. 41. Pigeon-tremex—the Horn-tail borer—( 2Vewe:(; Columba.) The larvae of many beetles are borers. I dare say that this log on which we are sitting is bored through and through by the larvae of Orthosoma hrun- neum, Porster. We do not greatly wonder that larvae of some of the four-winged flies, and of some of the beetles should bore in timber; but it does seem remarkable that larvae of some of our moths should do the same. Yet the larvae of Cossus centerensis, Lintner, bore in the Balsam Poplar; the larvae of Prionoxystus, robinice, Peck, bore in the locust; the larvae of Prionoxystus MacTuurtrei, , bore in the oak; the larvae of JEgeria apiformis, Clerck, bore in the willow; the larvae of Sesia acerni, Clemens, bore in the maple; and there are others of like habits. Turning our attention to the trees again. There is a White Cedar. Cedar is not plentiful on the Eastern Town
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