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Rove Beetle - Xantholinus longiventris

Rove Beetle - Xantholinus longiventris
Krain, Unincorporated King County, Washington, USA
March 31, 2014
Size: 6.5mm
Looks like (or near) Xantholinus linearis? Found in the daytime under a piece of plywood on the ground. Nearby trees were Douglas Fir and Bigleaf Maple.

Images of this individual: tag all
Rove Beetle - Xantholinus longiventris Rove Beetle, ventral side - Xantholinus longiventris Rove Beetle - Xantholinus longiventris

cool --thanks guys
Moved from Xantholinus.

Moved from Xantholinini.

Xantholinus for sure. There i
Xantholinus for sure. There is also Xantholinus longiventris in the west, which does not have microsculpture on the middle of the pronotum. Hard to say for sure but it looks like it is missing on your beetle.


I'm not familiar with these at all, so I'm not sure what microsculpture would look like - I posted a slightly more zoomed in view, if that helps at all (I only see tiny dimples or punctures). I still have it if you could describe a little what I should look for, that way I can photograph it from the right angle. I'd be interested in pursuing the ID if there's really a possibility of X. longiventris since that'd be new to the Guide.

Microsculpture would be tiny
Microsculpture would be tiny lines going across the pronotum, this is usually best seen in the highlights of a photo. Check other photos of this species in the guide to see the lines. In your close up I can see only a smooth surface so this should be X. longiventris.


Thanks to both of you! I just checked the specimen under the microscope (unfortunately, the poor thing was crispy and broke into 3 pieces), but I saw what you meant. The middle of the pronotum is completely smooth, no tiny fingerprint-like ridges... but I did see those tiny ridges on the head, but only on the sides, none in the center.

Great! Microsculpture and the
Great! Microsculpture and the number of punctures are very important when identifying Xantholinini, especially from photos (the group of rove beetles that yours belongs to).

great to know!
I will remember that now if I photograph any others, thanks!

X. linearis is a great call, must be it
i asked Adam to take a look, hope he confirms

Moved, Im not enough of a staph person to go further :)
Moved from Beetles.

Thanks, Blaine!

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