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Black beetle--ground or darkling? - Eleodes goryi

Black beetle--ground or darkling? - Eleodes goryi
Williamson County, Texas, USA
August 24, 2008
Size: ~ 3/4 inch
Late yesterday afternoon, in shaded areas, I saw several of these beetles trundling along at a good rate. When they realized they were observed, they stopped, then tried to hide under something (not really concealed--just under a drooping stem of grass, etc.) Then they'd take off again. I've seen them before, usually in late afternoon or evening; they're commonest on thin-soiled or rocky areas with sparse vegetation (or I'm not seeing them in the thicker stuff.)

Moved, seems to be a female Eleodes goryi...

Moved from Darkling Beetles.

Eleodes, i believe

After looking through my beet
After looking through my beetle field guide again, I found a tenebrionid that looked a lot like this one labeled _Triorophus_ and when I searched BugGuide for that genus, I found this: which looks to me just like mine, only smaller. (Mine was definitely over 10mm.) I'm going to leave this image in Darkling Beetles for awhile longer, in hopes of picking up a confirmation/correction from someone more expert, but definitely leaning to _Triorophus_ sp.

For one thing, the beetle in your thumbnail has a head nearly as wide as the pronotum whereas the one above appears to have a head considerably narrower than its pronotum.

Do you have a counter-suggest
Do you have a counter-suggestion?

Obviously I'm still just learning about the beetles, so a pointer to the right direction would be much appreciated.

I expect Kojun Kanda will be able to ID it.
He is our resident darkling beetle expert.

Moved from ID request to Dark
Moved from ID request to Darkling Beetles

Probably Darkling
The more domed shape of the elytra would make me say Darkling but I'd wait for confirmation.

Should add that I tinkered wi
Should add that I tinkered with the histogram adjustment so that the shadowed part of the beetle showed structure a little better.

Not necessary.
Unless an 'adjustment' radically changes the image, no need to mention it....This 'is' definitely a tenebrionid, by the way, but not one I've seen before.

Antennae question
My "beetle book" says that the tenebrionids have threadlike or clubbed antennae, but this one looks borderline between beaded and sawtoothed to me (judging by the illustrations there.) Anyone care to help me out with what this guy's antennae are?

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