. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. ENTOMOLOGICAL SOCIETY OF ONTARIO. sa reach their perfect state. We can understand how it could pass in the May-fly to pre- dacious insects, such as the spider and the ground-beetle, but not so readily how it could find a second host in a a vegetable devourer, such as the locust or the caterpillar. It may be that the encysted worm is cast off with the pseud-imago skin of the fly, or that it survives the decay of the fly itself, and, being caught in the herbage, is taken in by some hungry herbivorous
. Annual report. Entomological Society of Ontario; Insect pests; Insects -- Ontario Periodicals. ENTOMOLOGICAL SOCIETY OF ONTARIO. sa reach their perfect state. We can understand how it could pass in the May-fly to pre- dacious insects, such as the spider and the ground-beetle, but not so readily how it could find a second host in a a vegetable devourer, such as the locust or the caterpillar. It may be that the encysted worm is cast off with the pseud-imago skin of the fly, or that it survives the decay of the fly itself, and, being caught in the herbage, is taken in by some hungry herbivorous insect. The chances against it, in this case, seem to be very great. Still, when we remember the vast number of eggs laid by on© female Gordius—they have been estimated at more than six millions and a half—we must allow that there is a very broad margin for failures ; a,nd that if only a small percentage of the brood arrives at perfection, there must be a very great number, indeed, of hair- snakes that run the full length of days allotted to their kind. In the case of the tape-worm, lauiia solium, we know that the ova survive the decomposition of the ejected proglottides or divisions of the worm, and are swallowed by hogs and sheep as they feed upon the vegetation. Another kind of creatures that affords us much food for reflection is the Aphides. One day in July of this year I found two patches of these ''plant-lice" on the broad Windsor beans growing in my garden. My first impulse was to destroy the intruding insects, but entomological curiosity overcame horticultui'al prudence, and I made up ray mind to allow the insects to run their course. By the end of August there was not a stalk in the double row of beans (which was 12 yards long) that was not black with aphides. The insects clustered especially on the topmost leaves, and among the flowers, and along the edges of the pods. The winged brood of the species appeared in the middle of September. The number of famil
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsectp, bookyear1872
