Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 382 AN ECONOMIC ENTOMOLOGY. 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 'g in the host, and in the case of the ' swallow-tail,' the caterpillar retains strength enough to change to a chrysalis ; but from
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 382 AN ECONOMIC ENTOMOLOGY. 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 'g 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 Tragus exe- son'us, 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 Fig. 440. 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 BraconidcE 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, Ophwn tnaciinum, and larva.
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