Efferia quadrimaculata

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. Description Small to large-sized robber flies (10–40 mm) with distinctly different shape of the posterior end of the abdomen in males versus females.

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