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The Asiloidea comprise a very large superfamily insects in the order Diptera, the true flies. It has a cosmopolitan distribution, occurring worldwide. It includes the family Bombyliidae, the bee flies, which are parasitoids, and the Asilidae, the robber flies, which are predators of other insects.
Harold Oldroyd (24 December 1913 – 3 September 1978) was a British entomologist. He specialised in the biology of flies, and wrote many books, especially popular science that helped entomology to reach a broader public. His The Natural History of Flies is considered to be the "fly Bible". Although his speciality was the Diptera, he acknowledged that they are not a popular topic: "Breeding in dung, carrion, sewage and even living flesh, flies are a subject of disgust...not to be discussed in polite society". It was Oldroyd who proposed the idea of hyphenating the names of true flies (Diptera) to distinguish them from other insects with "fly" in their names. Thus, the "house-fly", "crane-fly" and "blow-fly" would be true flies, while the "dragonfly", "scorpion fly" and so on belong to other orders. He also debunked the calculation that a single pair of house-flies, if allowed to reproduce without inhibitions could, within nine months, number 5.6×1012 individuals, enough to cover the Earth to a thickness of 14.3 m (47 ft). Oldroyd calculated that such a layer would only cover Germany, but remarked "that is still a lot of flies".
The Asilidae are the robber fly family, also called assassin flies. They are powerfully built, bristly flies with a short, stout proboscis enclosing the sharp, sucking hypopharynx. The name "robber flies" reflects their expert predatory habits; they feed mainly or exclusively on other insects and, as a rule, they wait in ambush and catch their prey in flight.
The Therevidae are a family of flies of the superfamily Asiloidea commonly known as stiletto flies. The family contains about 1,600 described species worldwide, most diverse in arid and semiarid regions with sandy soils. The larvae are predators of insect larvae in soil.
Ironomyiidae is a small family of flies in the order Diptera. Historically, they had been included in the family Platypezidae, and includes three extant species within the single extant genus Ironomyia endemic to Australia and a number of extinct fossil genera from North America and Asia extending back to the Early Cretaceous.
Laphria is a genus described by Johann Wilhelm Meigen in 1803, belonging to the family Asilidae, subfamily Laphriinae. Members of this genus are known as bee-like robber flies. This genus has a Holarctic distribution, occurring in Europe, Asia, and North America. They prey on a variety of insects, including other robber flies, bees, wasps and beetles. Like other asilids, they use their proboscis to penetrate the body of their prey and inject enzymes which dissolve the tissues.
Efferia is an insect genus of mainly neotropical and nearctic Diptera in the family Asilidae or robber flies. It is one of the most species-rich genera of Asilidae, with particularly high diversity in arid or semi-arid ecosystems of the New World.
Diogmites is a genus of mainly neotropical flies in the family Asilidae or robber flies.
Stenopogon is a genus of robber flies, insects in the family Asilidae. There are at least 200 described species in Stenopogon.
Asilus is a genus of robber flies in the family Asilidae. There are at least 150 described species in Asilus.