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Photo#409630
small metallic fly - Microchrysa polita? - Microchrysa polita - female

small metallic fly - Microchrysa polita? - Microchrysa polita - Female
Riverhead, Suffolk County, New York, USA
June 11, 2010
Size: 3 mm. est.
Observed in vegetable garden on straw mulch.
There appears to be sparse "hairs" at the abdominal distal end.
Similar to this one:

Moved
Moved from Flies.

The ID is correct, the two ap
The ID is correct, the two appendages at the end are the so called cerci, they are not hairs, but they have hairs on them and are sensory organs important during mating and egg laying...

 
Microchrysa polita
Cerci ... important during egg laying. Does this mean that this is a female (eyes are widely separated)?

The info page says that some Soldier Fly larva are carnivorous. Is it known if this Genus is carnivorous and if so what they feed on?

I belong to a community garden where many of the gardeners think most insects are detrimental to their vegetables and am trying to take as many photos of the insects there as I can and learn about their life cycles in the hope that they will become more welcoming to them.

Thank you, Martin, for the ID and information

 
Yes it is a female, males hav
Yes it is a female, males have a head which is completely covered by the eyes... This species is an import from Europe, the adults are just harmless flower feeders and pollinators (although not really important ones compared to bees). Here is a copy from Rozkosnys book about this species:
"Larvae have been bred from dung, various kinds of decaying organic material, rotting grass, garden refuse, compost, soil beneath moss on
old tree-trunks, etc. The mature larvae overwinter. The adult flies may act as vectors for pathogenic microorganisms and may pollute the vegetation in gardens, including vegetable and fruits."
But they are not really considered a pest.

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