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Photo#181482
Polypore Teneb - Platydema americanum

Polypore Teneb - Platydema americanum
Blue Mountain (N43º30.9'W080º15.47'), Collingwood, Ontario, Canada
Size: 6 mm
Emerged in the past few days (probably May 6) from a heavily-decayed Dryad Saddle (Polyporus squamosus) collected Dec. 27, 2007. Don't know where to start on this one...

Images of this individual: tag all
Polypore Teneb - Platydema americanum Polypore Teneb - Platydema americanum Polypore Teneb Larva - Platydema americanum Polypore Teneb Larva - Platydema americanum

i tend to agree with your Dx, Stephen
Moved from Platydema.

Keyed using Triplehorn (1965a)
I went through the Platydema key in Triplehorn's "Revision of Diaperini of American north of Mexico with notes on extralimital species (Coleoptera: Tenebrionidae)". [Proceedings of the United States National Museum No. 3515, 117: 349-458.]
The combination of luster, elytral striae, ventral separation of the eyes (less than 1.5x eye diameter), and the transverse, arcuate shape of the broadly-expanded pronotum all point to this being P. americanum.

Thanks Jim!
Looks like some of the yet-unidentified-to-species examples in the guide.

This is one of the Platy*dema
is my guess based on habitus and host: http://bugguide.net/node/view/9267/bgimage

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