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Photo#546665
bristle-butt fly? - Archytas metallicus - male

bristle-butt fly? - Archytas metallicus - Male
paoli, orange County, Indiana, USA
July 16, 2011
Size: approx 11mm
Beside knowing the name of this beast, I'd like to read an explication for all the bristles - their purpose?

Moved
Moved from Archytas.

Moved
Moved from Tachinini.

Tachinidae: Archytas sp.
Tachinidae: Archytas sp.

looks like Archytas to me; our tachinid expert will tell
no idea about the bristles, though; others may have answers, pls stay put. long sturdy setae usually work in insects as mechanical sensors, but most flies manage with less extravagant setups.
whatever their function might be, the bristle arrangement patterns are routinely used in fly identification, and an elaborate terminology exists --every damn seta has its name (check out this diagram; humbling, eh?)
some members of this family, called 'urchin flies' in Russian, have most outrageous looks, e.g.:

Moved from ID Request.

 
spasibo
thanks mr(?) belov for this ID, and for all the work you do on this site.

OMG, on the diagram. that is daunting.

keeping setae clean must be laborious; their legs reach to all areas? if so, they are quite yogic.

"urchin fly" is good; very descriptive. however, my "bristle-butt fly" is more fun and alliterative.

 
"keeping setae clean"
now that you brought this up, i realize that, quite surprisingly, i haven't seen one single tachinid with a dusty coat --say, loaded with pollen, breadcrumbs, or stuff like that --quite a contrast to great many flower-frequenting beetles who always manage to look untidy... or, say, bees...

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