Ephydra hians
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Ephydra hians, commonly known as the alkali fly, is a species of fly in the family Ephydridae, the brine flies.
Vast numbers of Ephydra hians at Mono Lake
Ephydridae
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Ephydridae is a family of insects in the order Diptera.
Hyadina pulchella note the patterned wings, wide mouth and (on upper side) plumose arista