Economic entomology for the farmer Economic entomology for the economicentomolo00smit_0 Year: 1896 382 AN ECONOMIC ENTOMOLOGY. Fig. 440. length, and the wings expanding fully an inch and a quarter or even more. This makes the species easily recognizable, and it will serve very fairly as a type of this particular branch of the family. Species of this size usually lay only a single egg in the host, and in the case of the 'swallow-tail,' the caterpillar retains strength enough to change to a chrysalis ; but from this chrysalis there emerges through an ugly hole in the side the Trogus ex
Economic entomology for the farmer Economic entomology for the economicentomolo00smit_0 Year: 1896 382 AN ECONOMIC ENTOMOLOGY. Fig. 440. length, and the wings expanding fully an inch and a quarter or even more. This makes the species easily recognizable, and it will serve very fairly as a type of this particular branch of the family. Species of this size usually lay only a single egg in the host, and in the case of the 'swallow-tail,' the caterpillar retains strength enough to change to a chrysalis ; but from this chrysalis there emerges through an ugly hole in the side the Trogus exe- sorius, which has just been described. Frequently, however, in smaller species, a considerable number of parasitic larvae develop in one caterpillar. Of quite a different type, as compared with those just described, are the species of Ophion. These are large or very large creatures, black or honey-yellow in color, and the bodies are transversely flattened and squarely cut off at the pos- terior extremity. They are thus blade-like in shape, and the ovipositor rests concealed in a groove in the squarely cut off end segment. Though these insects are not stinging Hymenoptera, strictly speak- ing, yet the ovipositor is so short and sharp that the in- sects make use of it as a means of defence. They should be carefully handled, therefore ; though the sting, if *' hot'' for a few moments, seems not to be so poisonous as that of the bees and wasps. In the family Braco7iidcs the species are smaller, as a rule,—sometimes very small indeed,—and all are parasites. The difference between the pre- vious and the present family is in the venation, and is not easily made out, except by the special student ; nor from a practical stand-point is the matter an important one. It is among the members of this family that we find many of the minute creatures Long-tailed Ophion, Ophion macrtirum, larva. and
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