Ichneumon flies are solitary insects, and most are parasitoids—the larvae feeding on or in another insect which finally dies. As with all hymenopterans, ichneumons are closely related to ants and bees. The female finds a host and lays an egg on, near, or inside the host's body. Upon hatching, the larval ichneumon feeds either externally or internally, killing the host when they themselves are ready to pupate. The large ichneumon fly (Thakessa), with long flexable ovipositor. The various parts of ths ovipositor are spread aapart in the figure; naturally they lie together to form a single piercing organ.

Ichneumon Fly

Ichneumon flies are solitary insects, and most are parasitoids—the larvae feeding on or in another…

Ichneumon flies are solitary insects, and most are parasitoids—the larvae feeding on or in another insect which finally dies. As with all hymenopterans, ichneumons are closely related to ants and bees. The female finds a host and lays an egg on, near, or inside the host's body. Upon hatching, the larval ichneumon feeds either externally or internally, killing the host when they themselves are ready to pupate. The large ichneumon fly (Thakessa), with long flexable ovipositor, boring to deposit eggs.

Ichneumon Fly

Ichneumon flies are solitary insects, and most are parasitoids—the larvae feeding on or in another…

Female Isosoma ovipositing in stem of wheat.

Isosoma

Female Isosoma ovipositing in stem of wheat.

Isosoma tritici, larva.

Isosoma

Isosoma tritici, larva.

Isosoma tritici, larva.

Isosoma

Isosoma tritici, larva.

Isosoma tritici, adult female.

Isosoma

Isosoma tritici, adult female.

Isosoma tritici, fore-wing.

Isosoma

Isosoma tritici, fore-wing.

Isosoma tritici, hind wing.

Isosoma

Isosoma tritici, hind wing.

Larva, the second stage of the lace-wing fly.

Larva

Larva, the second stage of the lace-wing fly.

Sphinx larva covered with Microgaster cocoons.

Larva

Sphinx larva covered with Microgaster cocoons.

A psocus lineatus.

Book Louse

A psocus lineatus.

Trypeta pomonella. The parent of the apple-maggot.

Apple Maggot

Trypeta pomonella. The parent of the apple-maggot.

"Seed-corn Maggot (Phorbia fusciceps). a, maggot; b, pupa. Kernels of Maize, showing work of the maggot." -Whitney, 1911

Seed-Corn Maggot

"Seed-corn Maggot (Phorbia fusciceps). a, maggot; b, pupa. Kernels of Maize, showing work of the maggot."…

When the common mosquito is first hatched in the water it is called a wriggler. After developing to its full size, the back opens and the winged insect emerges.

Mosquito

When the common mosquito is first hatched in the water it is called a wriggler. After developing to…

Mosquitos are parasitic insects that suck blood from humans and other mammals. They are known to spread malaria and other diseases.

Mosquito

Mosquitos are parasitic insects that suck blood from humans and other mammals. They are known to spread…

When the common mosquito is first hatched in the water it is called a wriggler.

Mosquito

When the common mosquito is first hatched in the water it is called a wriggler.

An insect known as the pigeon horntail (Tremex columba) deposits its eggs, by means of a strong, piercing ovipositor, half an inch deep in the trunk wood of growing trees. Female uses ovipositor to bore through bark into wood, depositing 1 slender egg in each hole. Eggs are covered with fungal spores from a special pocket in female's abdomen. After depositing the last egg, the female often dies without removing its ovipositor from the wood. The dead female becomes food for some insectivorous animal.

Pigeon Horntail

An insect known as the pigeon horntail (Tremex columba) deposits its eggs, by means of a strong, piercing…

Pithy gall on blackberry, made by Diastrophus nebulosus.

Pithy Gall

Pithy gall on blackberry, made by Diastrophus nebulosus.

Pithy gall on blackberry, section to show cells.

Pithy Gall

Pithy gall on blackberry, section to show cells.

Pithy gall on blackberry, larva.

Gall Wasp

Pithy gall on blackberry, larva.

Pithy gall on blackberry, pupa.

Gall Wasp

Pithy gall on blackberry, pupa.

Pelecinus polyturator, male.

Pelecinid Wasp

Pelecinus polyturator, male.

Pelecinus polyturator, female.

Pelecinid Wasp

Pelecinus polyturator, female.

Trichogramma pretiosa, a parasite in insect eggs.

Trichogramma Wasp

Trichogramma pretiosa, a parasite in insect eggs.