identify this black beetle

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rh_monk San Diego, CA Aug 28, 2015

found in san diego. i'm not sure if it is a pest or if so what they could be eating.

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Flapdoodle Minot, ND Aug 28, 2015

Image not clear enough to be absolutely certain, but if its antennae are not clubbed on their ends, it most likely is a ground beetle, an active predator on other small arthropods.

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rh_monk San Diego, CA Aug 29, 2015

i think the antennae might be clubbed? it moves fast and is constantly trying to climb, that s why the bad pictures. if its a predator of other arthropods, is it possible to know which? that could be positive if it's eating the pests in my yard

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Post #10134382
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Flapdoodle Minot, ND Aug 29, 2015

From these images, I believe that the beetle most likely is a darkling beetle (family Tenebrionidae), possibly a Neobaphion sp. - see http://www.boldsystems.org/pics/_w300/CNCCD/CNC_COLEO_00126816%2B1309269280.JPG for an example. This is not a pest.

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