. Common Illinois insects : and why they are interesting. Insects -- Illinois. Saddle-back {Sibine stimulea) destroyed by parasites. Millions of destructive caterpillars are victims of parasitic wasps whose larvae grow inside body and emerge to spin cocoons. (3x) Parasites differ from the preda- tors in that they enter the body of the victim, called the host, feeding on blood or tissues until full grown. By this time the host is dead or nearly so, and the parasite trans- forms to adult which mates and lays its Qgg on another victim. The long "sting" ou the body of the Long- tailed Me
. Common Illinois insects : and why they are interesting. Insects -- Illinois. Saddle-back {Sibine stimulea) destroyed by parasites. Millions of destructive caterpillars are victims of parasitic wasps whose larvae grow inside body and emerge to spin cocoons. (3x) Parasites differ from the preda- tors in that they enter the body of the victim, called the host, feeding on blood or tissues until full grown. By this time the host is dead or nearly so, and the parasite trans- forms to adult which mates and lays its Qgg on another victim. The long "sting" ou the body of the Long- tailed Megarhyssa is actually an egg laying organ (ovipositor) used in inserting the eggs in the burrows of a pestiferous insect, the elm and maple borer (pigeon tremex). After hatching from the egg the parasitic larva crawls along the burrow until it finds the wood-boring larva, its Long-tailed Megarhyssa {Megarhyssa lunator). Belongs to large family of wasps that kill insect enemies of man. (life size) A great number of caterpillars of moths, including pests like the army worm, the white-marked Tus- sock moth, and the tent caterpillar are destroyed by the parasitic larvae of smaller wasps belonging to the family Ichneumonidae. There are still other wasp families, the Chalcidae and the Braconidae whose members parasitize caterpillars and other in- sects. The cocoons (not eggs) shown on the Saddle-back caterpillar are typical of silken Braconid cocoons so commonly seen on tomato worms. It is a fact worth noting that the number of young parasites may be much greater than the number of eggs actually laid, since many em- Ibryos are developed from a single egg (polyemhryony).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wright, A. Gilbert (Arthur Gilbert), 1909-. Springfield, Il. : Dept. of Registration and
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