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fungus beetle - Tritoma humeralis

fungus beetle - Tritoma humeralis
Groton, Middlesex County, Massachusetts, USA
September 23, 2007
Size: ~4mm
Found in the gills of a large white ground mushroom.

Images of this individual: tag all
fungus beetle - Tritoma humeralis fungus beetle - Tritoma humeralis fungus beetle - Tritoma humeralis fungus beetle - Tritoma humeralis

Tim comes through again!
You and Downie and Arnett nailed down another good id.
Thanks again Tim.

Blind squirrels
Thanks Tom, and I really do enjoy working through these IDs. Thanks for letting my try on your posts. But I really am just an amateur (who's never even seen most of these beetles before!), and it's really just a matter of time before more real NAmer beetle guys get plugged into this site and start making me look silly. Although I'll miss some of the challenge, we'll all benefit from it.

Even a blind squirrel finds an acorn every once in a while.

Nice image
of a beautiful little beetle.

Thanks Jim
Now to see if it can be identified to species.

There are two names that seem to fit:
Tritoma bigu*ttata and Tritoma erythr*ocephala. I'd guess it's the latter since your image of bigu*ttata lack the red head this one has, not to mention other differences.

T. erythr*ocephala
Jim, are you confident enough to think a page should be made? I couldn't find any pictures on the internet.

Heck no :-)
It's just that the name means red head and yours has a red head.

I've just checked all my beetle books. Not shown. That's a shame for such a pretty beetle.

T. humeralis
keying using Downie and Arnett, this one appears to key well to T. humeralis Fabricius, one of 10 from the northeast . T. biguttata is similar, but T. humeralis is separated in the key at the second couplet by "venter entierly reddish yellow" leads to T. biguttata, while "venter piceous, at least on midline of thoracic and abdominal segments" leads to T. humeralis (Dillon2 lists both, but key and descriptions are less helpful, and I suspect the 2 illustrations may be reversed). T. erythr*ocephala appears to not have any red on elytra. Description for T. humeralis includes "transverse red line behind eyes", which yours appears to have. Listed as "Common" with wide distro including MA and NH.

Moved from Beetles.

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