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Photo#45994
Another type of two-horned darkling beetle - Platydema excavatum - male

Another type of two-horned darkling beetle - Platydema excavatum - Male
Nashua, Hillsborough County, New Hampshire, USA
March 25, 2006
Size: about 4 mm
Found under loose deciduous bark. My guess, based on headgear, is that it's a male.

Images of this individual: tag all
Another type of two-horned darkling beetle - Platydema excavatum - male Another type of two-horned darkling beetle - Platydema excavatum - male

Platydema excavatum
Moved from Platydema.

 
Thanks for the det.
Further in-detted to you now ;-) My Platydema stable is filling up.

Platydema sp.
Either Platydema teleops or excavatum. In those the males have horns, just like scarabs. If I consulted my former advisor's revision of the group, probably the name could be nailed down. Some day.

 
Could be either.
viewing images of each on the Wisconsin Tenebrionids site, I still can't decide. Their teleops has a larger length-to-width ratio and horns a little longer than this one's whereas their excavatum is closer in L:W ratio but has dinky horns compared to this one.

 
horn length is variable
They have major and minor males also. Looking at the variation in the collection, I decided a "no-call" was best.

Any idea why the horns are so
Any idea why the horns are so common among the tenebrionids, particularly the fungus feeding ones?

 
No
Whether the males have head-butting contests over females I don't know, but that is the case in many beetle groups. Nor do I know whether this one is a fungus feeder.

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