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blue beetles - Triorophus

blue beetles - Triorophus
Livermore / Sycamore grove park, Alameda County, California, USA
August 18, 2007
Size: 1/4"
I turned over a log that was embedded deep in the dry dirt and observed slow blue Beetles that appeared to be bothered by the sudden flood of light . There were about 12 of these guys and they all moved to find cover . I have never seen this type of beetle before and would appreciate any comments or help in their identification . Thanks , Beth ... the shutterbug

Images of this individual: tag all
blue beetles - Triorophus blue beetles - Triorophus

Moved from Eurymetopini.

Triorophus sp.
by now we have close-ups of some that look identical from AZ, some powder-blue and some shiny black

Moved from Darkling Beetles.

At that size, it may be a Triorophus, definitely a Eurymetopine. Never seen a Triorophus with such a blue waxy luster. Cool pics.

Am I right in thinking that means
tribe Eurymetopini in subfamily Opatrinae? We don't use tribes (yet) but we could place it in the subfamily.

The tribe is in the Pimeliinae.

You made me go back to American Beetles.
Sure enough, Pimeliinae >> Eurymetopini. I don't know what I was looking at before that gave me the idea of Opat*rinae. Oh, and I see we *do* have tribes under Pimeliinae.

The blue may be a powdery wax coating
such as found on various desert tenebrionids and iron*clad beetles. The wax seals in moisture and becomes powdery as it ages, causing a bluish effect over the underlying black exoskeleton.

I think they might be tenebri
I think they might be tenebrionidae. I cannot find pics of all the Asbolus specs in your area, but that might be the genus.

face shot
If the little guys are still around, a shot of the top of the head would be helpful in ID.

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