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Photo#600401
Diptera pupa? - Epicypta

Diptera pupa? - Epicypta
Groton, Middlesex County, Massachusetts, USA
December 10, 2011
Size: 5.5mm cocoon
This was attached to the underside of a log.

Images of this individual: tag all
Diptera pupa? - Epicypta Diptera pupa? - Epicypta Diptera pupa? - Epicypta

Moved
Moved from Beetles.
Thanks for taking a look, Chris! Do Phronia spp. have similar pupal cases?
Also, Tom, do all the ones you found have that same hole?

 
Thanks Charley and Chris
The other cases all have the same hole, but part of the pupa is blocking it.

 
Phronia larvae
Phronia larvae have a more limpet like covering (see here: http://www.diptera.info/photogallery.php?photo_id=5692)

Mycetophilidae: Epicypta
This is the pupal cocoon found in members of the genus Epicypta. I assume the hole is to allow the adult to emerge (since they have no mandibles to chew their way out). Another picture of a similar beastie can be found here:http://www.diptera.info/photogallery.php?photo_id=6756

Moved
Moved from ID Request.
Adding a link to the diapriid that emerged:

Coleoptera?
reminds me more of a Coleopteran pupa than Dipteran, I'm no expert on such things though :)

 
You might be right
I'm keeping it and hope it matures.

 
The cocoon/cell
also seems more like something a beetle larva would construct. I wonder what that hole in the end means...

 
Hole in the tail end
I wonder if that black knob on the tail of the pupa was filling that hole.

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