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; economicentomolo00smit Year: 1906 THE INSECT WORLD. 385 very few, except small forms, which are quite 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 geniculated 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 groo
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; economicentomolo00smit Year: 1906 THE INSECT WORLD. 385 very few, except small forms, which are quite 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 geniculated 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 , ,. ... . . Aphehnus mytilasptdis, parasite on scale numerous, and are parasitic on insects; 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 good example. If, early in the spring, a large number of chrysalids of the cabbage butterfly be collected,—which can be easily done along the fences bordering last year's cabbage-field,—it will be found that some of them have a rather warm gray color and move the joints of the abdomen freely, evidently showing life. Others will have a peculiar, dead, straw-yellow color, and the abdomen is brittle and will break rather than move. If it does break, the interior of the chrysalis will be found completely filled with little, greenish-gray, maggot-like larvae, in which the seg- ments are well marked and a little darker in color. If such infested chrysalids be removed to a warm room and kept in a covered vessel, there will emerge in due time dozens of Pter^- viahis pupariun, a greenish-bronze Chalcidid, instead of the common white cabbage butterfly. Though these insects are minute,
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