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Unknown insect - Agrilus pulchellus

Unknown insect - Agrilus pulchellus
San Pedro River Valley, SE of San Manuel, Pinal County, Arizona, USA
August 11, 2011
Size: approx 12 mm
I'm not even sure what kind of insect this is; I've only seen it twice and it always flies off before I can get close to it - hence, a poor photo with only a side view. I thought it might be an immature form of a White striped Tiger Beetle or Carolina Metallic Tiger Beetle since there were some adults around at the same time (although only at night, and the Carolina Metallic only near water), but other than the metallic look, I don't see much similarity. This was seen on dry grass stems on a flat dry mesa with occasional Palo Verdes, ocotillos, rare mesquites, Saguaros, and Jumping chollas. Thanks for any help.

Moved from Agrilus.

Moved from ID Request.

Immature tiger beetles live in burrows and look like this:

Buprestid beetle
can't comment on the species...
Edit: Maybe something related to

ID confirmed by H.A. Hespenheide: Agrilus pulchellus

Exactly what I was thinking...

...just a couple of minutes too late. :)

Let's see if the beetle specialists agree.

Thanks for your help - it makes it all so exciting. I would have never guessed!

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