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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".
Heteropogon is a genus of robber flies in the family Asilidae. There are at least 60 described species in Heteropogon.
Holopogon is a genus of robber flies in the family Asilidae. There are at least 60 described species in Holopogon.
Lamyra is a genus of robber flies in the family Asilidae. There are at least 30 described species in Lamyra.
Laphystia is a genus of robber flies in the family Asilidae. There are at least 50 described species in Laphystia.
Philonicus is a genus of robber flies in the family Asilidae. There are at least 20 described species in Philonicus.
Ktyr is an Old World genus in the robber fly family Asilidae.