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Photo#773468
Dorcus parallelus - male
Copyright © 2013 Ben Coulter

Dorcus parallelus - Male
Allegheny County, Pennsylvania, USA
May 20, 2013
Size: 20 mm
I believe this is Dorcus parallelus. Can this beetle be reliably sexed?

Images of this individual: tag all
Dorcus parallelus - male Dorcus parallelus - male Dorcus parallelus - male
Contributed by Ben Coulter on 21 May, 2013 - 12:28pm
Last updated 22 May, 2013 - 12:11pm

Moved
Moved from ID Request.
… Ben Coulter, 22 May, 2013 - 12:10pm

Sexing Lucanids
Interesting article on this issue:

Two Thresholds, Three Male Forms Result in Facultative Male Trimorphism in Beetles
J. Mark Rowland and Douglas J. Emlen
SCIENCE VOL 323 6 FEBRUARY 2009

If you don't have convenient access, you should be able to access it from Science if you sign up for a free account, which allows access to articles a year or more old.
… Stephen Hart, 21 May, 2013 - 1:58pm

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