Marsh Flies - Family Sciomyzidae
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These charming little flies are sometimes called "snail-killers" because their eggs are laid on, and the larvae parasitize snails, slugs, other mollusks, and crustaceans.
That's a dead crayfish that had been roasted in a prairie fire, in case you were wondering

Marsh flies are generally slender, yellowish or brownish, 1/4 - 1/2" long. They have fairly prominent eyes, prominent forward-pointing antennae, and bristles on the femora (upper hind leg). The wings are mottled with various light brown markings according to species. Marsh flies are common along the edges of ponds and rivers, and in marshy areas where the larvae prey on or become parasites of slugs & snails.

Habitat: Near ponds, streams, marshes. Range: Throughout North America. Food: Adults drink dew, nectar, and tree sap.

Marsh Fly
Very early spring marsh fly at West Chicago Prairie, DuPage County, Illinois

Marsh Flies
Marsh Fly, Tetanocera sp.

Marsh Fly, Sepedon species
Marsh Fly, Sepedon species

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Flies of North America - Order Diptera. Flies are prevalent in virtually all habitats, with over 16,000 species in North America. Flies can be distinguished from all other insects in that they only have one pair of normal wings. Most flies have compound eyes and mouthparts adapted for piercing, lapping or sucking fluids.
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