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Unknown Fly (with Yellow tarsal socks)

Unknown Fly (with Yellow tarsal socks)
Rydell NWR, Minnesota, Polk County, Minnesota, USA
July 7, 2010
Size: 8-10 mm
I'm not certain, but this looks like be a freshly pupated Marsh Fly (Sciomyzidae). Am I right? And what is with the yellow tarsal 'socks' and the maxillary 'bubble'? (Sorry for the poor photo. The image was captured from a video.) (Corrected error in entries for State and County for this specimen on 22 August 2010.)

Images of this individual: tag all
Unknown Fly (with Yellow tarsal socks) Unknown Fly (with Yellow tarsal socks)

Moved from Muscoidea.

Moved from Flies.

To me it looks closer to Muscidae than Sciomyzidae.

Thanks, John. I've just adde
Thanks, John. I've just added another photo of this specimen.

Moved from ID Request.

Moved for expert attention.

The "socks"
might be Milkweed pollinia. Here's a beetle wearing some:

As for the bubbling, there's a forum topic devoted to it here.

Thanks, Ken!
Ken, thank you for passing the fascinating information! I've added another view of this specimen.

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