3rd beach staph - Philonthus nudus - BugGuide.Net

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Copyright © 2015 Gary Griswold

3rd beach staph - Philonthus nudus

3.5 mi. SW Anacortes, Skagit County, Washington, USA
July 19, 2015
Size: ~ 9 mm

Under driftwood at a beach, appearing different from first beach staph submitted. Confirmation/correction, further placement would be appreciated.

Images of this individual: tag all

3rd beach staph - Philonthus nudus

3rd beach staph - Philonthus nudus

Contributed by Gary Griswold on 25 July, 2015 - 3:35pm
Last updated 19 March, 2021 - 5:52am

Moved

Moved from Philonthus.

… Boris Büche, 19 March, 2021 - 5:52am

We have genitalia sticking out -

so we can tell the narrow protarsi are not the female condition.
The species should be placed in Bisnius (male protarsi dilated in Philonthus).
Elytral punctures circular, and uneven placement of discal punctures on pronotum points in same direction.

Image of nudus from Russia shows the same pair of large punctures on vertex - I support the ID.

… Boris Büche, 19 March, 2021 - 5:20am

thanks again, Al -- very illuminating

Moved from Cafius.

… v belov, 25 July, 2015 - 4:37pm

Not Cafius

Looks like a Philonthus, maybe P. nudus which is coastal, and was originally described as a Cafius.

… Alfred F. Newton, 25 July, 2015 - 4:29pm

Moved

Moved from Rove Beetles.

… v belov, 25 July, 2015 - 3:48pm

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