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Photo#41412
Beetle Larva - Bolitotherus cornutus

Beetle Larva - Bolitotherus cornutus
Princeton, Worcester County, Massachusetts, USA
January 20, 2006
Size: 13mm
There were a bunch of these inside a large red mushroom on the side of a tree.

Images of this individual: tag all
Beetle Larva - Bolitotherus cornutus Beetle Larva - Bolitotherus cornutus - male Beetle Larva - Bolitotherus cornutus - male Beetle Larva - Bolitotherus cornutus - male Beetle Larva - Bolitotherus cornutus

Quite a difference between larvae.
Are you certain these are the lavae that became the B.cornutus pupa? Check out these larvae from Rattlebox.

 
This one is correct
I read the comments under Rattlebox's picture, and the results are very interesting.
The other one that you mentioned, there could be a mixup, but I don't remember collecting a larva that looked like yours.

 
More likely a mixup on my end.
I know I was incredulous that such a larva could produce a tenebrionid.

Rearing
If you saved the mushroom and larvae, it might be possible to get a larva/adult photo series for the bugguide site.

 
I'll have to go back
and see if I can get the mushroom. That makes sense, wish I would have thought of it at the time.

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