Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . Apanleles species.—Little mass of cocoons on leaf, replacing an infested larva; asingle cocoon below, from which adult has issued ; much enlarged. development and kill the caterpillar before it is much more thanhalf-grown. Many of these cocoon-forming species belong tothe genus Microgaster, and they are typical of a very largeseries in the fimily. The plant-lice-infesting forms frequentlybelong to the genus Aphidius. As in the previous family, manyof these insects have an ext
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . Apanleles species.—Little mass of cocoons on leaf, replacing an infested larva; asingle cocoon below, from which adult has issued ; much enlarged. development and kill the caterpillar before it is much more thanhalf-grown. Many of these cocoon-forming species belong tothe genus Microgaster, and they are typical of a very largeseries in the fimily. The plant-lice-infesting forms frequentlybelong to the genus Aphidius. As in the previous family, manyof these insects have an external ovipositor. While the preceding series of parasites contain a very fair pro-portion of large species, the next family, Chalddidce, contains THE INSECT WORLD. 385. very few, exeept small forms, which are cjuite usually metallic black, bronze, or green. The wings are without venation, except for a strong vein running parallel to the costal margin, but not reaching quite to the tip, and the antennae are geniculatecl Fig. 443. or abruptly bent at the end of the long first joint. Few of these have the ovipositor visible, and usually it lies in a groove on the under side of the tip of the abdomen, issuing before the apex. These Chalcidid flies are exceedingly . Aphelmus mxtilaspuiis, parasite on scale numerous, and are parasitic on i„secis; much enlarged. a great variety of other insects. They are rather more robust in build than the other small para-sites, and this fact, with their usually brilliant metallic coloration,is a tolerably good guide to the family, of which the species in-festing the common cabbage butterfly may serve as a goodexample. If, early in the spring, a large number of chrysalidsof the cabbage butterfly be collected,—which
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
