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. 381 when hatched, crawls along the burrow until it comes into contact with its host. It then punctures the skin and remains fixed to the outside, sucking the juices and gradually killing the borer. Fig. 43S. Pimpla conqnisitor.—a, larva; c, pupa ; d, adult; other references are to structural details. By no means all of our 'ichneumons,' even of those belong- ing to the family Ichneumon
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. 381 when hatched, crawls along the burrow until it comes into contact with its host. It then punctures the skin and remains fixed to the outside, sucking the juices and gradually killing the borer. Fig. 43S. Pimpla conqnisitor.—a, larva; c, pupa ; d, adult; other references are to structural details. By no means all of our 'ichneumons,' even of those belong- ing to the family Ichneumonidce, have external ovipositors ; yet there is a distinctive character in their appearance which is easily recognized but hard to de- scribe. The species belong- ^^^'- 439- ing to the typical genus Ich- neumon have rather long, slender forms, with flattened abdomen and no external ovipositor. They are often gaudily colored, the antennae are frequently banded with yellow, and many are metallic blue or green. The species are usually parasites on cater- pillars. One of the largest and most frequently noted species is that which infests the larvae of the common 'swallow-tail' butterflies. It is orange-yellow in color, with smoky-black wings, the body nearly an inch in
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