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Help w/ Worm/Larvae ID?

During repair of a damp area in a 2x4 stud/plywood construction wall in my house, I discovered what appeared to be damage from carpenter ants (southern New England). It was a very local area and while cleaning up I found 2 live 'worms'. Here is a link to a picture of one. Length is about 3/4 inch and whatever it is has 3 pairs of legs and antennae at the forward 'head' end (which is not a separate part). The head area is darker than the rest of the body. Does this sound like a carpenter ant larvae? I have seen a few carpenter ants in the house but other than these two worms, no sign of activity in this damaged area. Help with ID is greatly appreciated.

http://img516.imageshack.us/img516/6568/dscn1762e.jpg

It's a beetle larva
probably a darkling beetle, which are common in decaying wood.

 
Thank you for the help Michae
Thank you for the help Michael.

 
After looking at some images
After looking at some images of Darkling Beetle larvae (here), they look like a very close match tot he untrained eye. Are these typically found in large numbers? Do they colonize like ants?

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