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The fly has one pair of wings and sucking mouth parts.

Fly

The fly has one pair of wings and sucking mouth parts.

"In these the head is generally of considerable size, and is furnished with a pair of large, compressed eyes, which occupy nearly its whole surface. The legs are well-developed, the tarsi composed of five joints, terminated by a pair of claws; the abdominal rings are distinct." — Goodrich, 1859

Flies

"In these the head is generally of considerable size, and is furnished with a pair of large, compressed…

The larva of Efferia aestuans (or Erax bastardi), an insect in the Asilidae family of robber flies.

Robber Fly Larva

The larva of Efferia aestuans (or Erax bastardi), an insect in the Asilidae family of robber flies.

The pupa of Efferia aestuans (or Erax bastardi), an insect in the Asilidae family of robber flies.

Robber Fly Pupa

The pupa of Efferia aestuans (or Erax bastardi), an insect in the Asilidae family of robber flies.

The biting fly is also known as the bee killer fly.

Biting Fly

The biting fly is also known as the bee killer fly.

"a, eggs of the Breeze-fly; b, the same magnified; c, larva, or bot; d, chrysalis; e, perfect insect; f, female depositing her eggs" — Goodrich, 1859

Breeze Fly

"a, eggs of the Breeze-fly; b, the same magnified; c, larva, or bot; d, chrysalis; e, perfect insect;…

In the Crane Fly, only the front pair of wings is present.

Crane Fly

In the Crane Fly, only the front pair of wings is present.

"The tipulidae have the proboscis short, terminated by a pair of fleshy lips, inclosing two bristles." — Goodrich, 1859

Crane Fly

"The tipulidae have the proboscis short, terminated by a pair of fleshy lips, inclosing two bristles."…

The horse fly has but one pair of developed wings, the second pair being represented by a pair of balancers: their function is sensory.

Horse Fly

The horse fly has but one pair of developed wings, the second pair being represented by a pair of balancers:…

The head of the adult horse fly.

Horse Fly

The head of the adult horse fly.

The prothorax of the adult horse fly.

Horse Fly

The prothorax of the adult horse fly.

The mesothorax of the adult horse fly.

Horse Fly

The mesothorax of the adult horse fly.

The metathorax of the adult horse fly.

Horse Fly

The metathorax of the adult horse fly.

The abdomen of the adult horse fly.

Horse Fly

The abdomen of the adult horse fly.

The mouth parts of the adult horse fly.

Horse Fly

The mouth parts of the adult horse fly.

The head of the larva of the horse fly.

Horse Fly

The head of the larva of the horse fly.

The larva of the horse fly.

Horse Fly

The larva of the horse fly.

The larva of the horse fly.

Horse Fly

The larva of the horse fly.

The pupa of the horse fly.

Horse Fly

The pupa of the horse fly.

"The Ox-fly, Oestrus bovis, is three-forths of an inch long, and lays its eggs in the skin of young cattle, producing a swelling which supprates and forms a purulent humor, on which the larvae feed." — Goodrich, 1859

Ox Fly

"The Ox-fly, Oestrus bovis, is three-forths of an inch long, and lays its eggs in the skin of young…

Efferia aestuans (or Erax bastardi) is an insect in the Asilidae family of robber flies.

Robber Fly

Efferia aestuans (or Erax bastardi) is an insect in the Asilidae family of robber flies.

"Gall-gnat (female), a species of Cecidomyia natural size." -Whitney, 1911

Gall Gnat

"Gall-gnat (female), a species of Cecidomyia natural size." -Whitney, 1911

"In the family <em>Culicidae</em>, or Gnats, which include several pre-eminently bloodthirsty species, the proboscis is especially suited for their worm of torment. It is often half the length of the insect, slender, sightly thickened at the tip, and incloses six long, sharp bristles." &mdash; Goodrich, 1859

Gnats

"In the family Culicidae, or Gnats, which include several pre-eminently bloodthirsty species,…

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…

Metamorphosis of the mosquito, larva

Mosquito

Metamorphosis of the mosquito, larva

Metamorphosis of the mosquito, pupa

Mosquito

Metamorphosis of the mosquito, pupa

The pupa of a developing mosquito.

Mosquito

The pupa of a developing mosquito.

The larva of a developing mosquito.

Mosquito

The larva of a developing mosquito.

"A small two-winged fly, Culex pipiens, of the family Culicidae, suborder Nemocera, and order Diptera, called in America mosquito." -Whitney, 1911

Mosquito

"A small two-winged fly, Culex pipiens, of the family Culicidae, suborder Nemocera, and order Diptera,…

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.

"The Mosquitos, <em>Colex musquito</em>, which are very nearly allied to the gnats, are still greater pests than gnats." &mdash; Goodrich, 1859

Mosquitos

"The Mosquitos, Colex musquito, which are very nearly allied to the gnats, are still greater…