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Aquatic beetle - Hydrochus

Aquatic beetle - Hydrochus
Enumclaw, King County, Washington, USA
August 21, 2011
Size: ~4 mm
Collected at MV lights at night, near White River just south of Enumclaw. Aquatic beetle? Too big for Hydraenidae, possible Hydrophilidae or Dryopidae. Help appreciated.

Images of this individual: tag all
Aquatic beetle - Hydrochus Aquatic beetle - Hydrochus

Moved from Beetles.

Beyond genus, I don't have a clue about these guys. Maybe Tim Loh will be able to take the ID further.

Thank you....
appreciate the help...

If male
needs dissection to get further and so far I don't know how to sex these guys externally.

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