Exoprosopa sp. (Bee Fly sp.)

Description:

Bee-flies superficially resemble bees and this may offer the adults some protection from predators.
Adults generally feed on nectar and pollen, but the larvae of the bee-flies are predators (or parasitoids) of the eggs and larvae of other insects. 
Bee-flies are often recognizable by their stocky shapes, by their hovering behavior, and for the particular length of their mouthparts and/or legs as they lean forward into flowers. 
Unlike hoverflies, which settle on the flower as do bees and other pollinating insects, those bee-fly species which have a long proboscis generally feed while continuing to hover in the air.
Bee-fly Species with shorter proboscis do land and walk on flower heads, and can be much harder to distinguish from hoverflies in the field. 
Many bee-fly species spend regular time intervals at rest on or near the ground, while hoverflies hardly ever do so. 

Cape Cod, Massachusetts, USA, 10 August 2017

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