Family Dolichopodidae

Bodenheimer (Animal Life in Palestine, 1935) has this to say:
Other predacious flies are the Therevidae, the Empedidae, whose singular nuptual flights and rituals deserve special attention, and the long-legged Dolichopodidae (Sciapus albifrons, Hydrophorus litoreus). The species of the last mentioned family are often confined to the presence of water and shade.

From Wikipedia:
Dolichopodidae is a large family of flies with approximately 6500 described species in about 200 genera distributed worldwide. These are generally fairly small, metallic flies with large, prominent eyes but otherwise they show considerable variation: most have long legs but some do not. The males often have enlarged genitalia which can be useful for species recognition. The adults are predatory on other small animals.
The larvae occupy a wide range of habitats, both terrestrial and aquatic, and can be predators or scavengers.

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