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Graphoderus liberus

Graphoderus liberus
Sanbornville, Carroll County, New Hampshire, USA
June 4, 2014
Size: 11 mm
Found dead in a parking lot.

Images of this individual: tag all
Graphoderus liberus Graphoderus liberus Graphoderus liberus Graphoderus liberus

Moved from Dytiscinae.

Definitely G. liberus

Moved from Rhantus.

I was able to get a closer look
at this photo today and it seems to lack the notch along the anterior margin of eyes, suggesting that this is a Graphoderus instead. And the only Graphoderus of that size in our area is Graphoderus liberus, which has a pronotum completely yellow to reddish brown, without black markings. I cannot see that very clearly in your photo. If you could add a picture showing the insect head on or little sideways, that would help tremendously. Example here

added two photos
hope they're helpful!

Now we can safely say that it is a member of the subfamily Dytiscinae because it lacks the notch on the inside margin of the eyes and that it cannot be a Rhantus.
By looking at the photos a little longer, I am more and more puzzled.
It could be a Graphoderus but I find the ventral color way too dark.
I'll play with it a little more and see if I can make up my mind.
Meanwhile, I'll move them to Dytiscinae.

I measured the specimen...
It is 11 mm. Thanks for the ID!

Looks like Graphoderus
but I cannot say for sure with that picture. If insect between 8 and 13 mm then Rhantus but if over 13 mm, Graphoderus!

Moved from Beetles.

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