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Photo#861833
Ground beetle - Pseudamara arenaria

Ground beetle - Pseudamara arenaria
Edmundston, Madawaska County, New Brunswick, Canada
June 15, 2013
Size: 5,2mm
Is this Harpalus rufipes, only 5,2mm ?

Images of this individual: tag all
Ground beetle - Pseudamara arenaria Ground beetle - Pseudamara arenaria Ground beetle - Pseudamara arenaria

Going for it
I think Pseudamara was the right call, it looks just like it.
Moved from Harpalinae.

 
Thank you very much for all o
Thank you very much for all of your contributions..

 
awesome -- thanks all, great bug

 
For what it's worth,
I compared the single specimen of Pseudamara that I've collected with these photos, and didn't see anything that made me think otherwise.

stumped... certainly not related to H. rufipes
palpi look special but the image may show processing artifacts; not even sure it's the same tribe
cool beast

 
Maybe Bradycellus ---
based on harpaline habitus, small size ("5.2"mm), acuminate (sharp) palps, and suggestion of mentum tooth. A few Bradycellus do have pronotal hind corners angulated as suggested by images. I don't see any punctures for sure atop elytra which is characteristic of Bradycellus lecontei. Body appears too "fat" and pronotal details don't look right to be that one, but who knows, photos can be so misleading!

 
New insight --
Actually it now dawned on me that the "fatness" and apparent absence of elytra punctures should point to "Amara".

 
Finer tuning to Amara's cousin Pseudamara arenaria (LeConte)
is my current best fit. I have two Wisconsin specimens of P. arenaria to compare. Yes, the labial & maxiallary palps narrow to long fine points.

 
per Kirill Makarov, the prosternal bead rules out Pseudamara
he says it has to be a Celia, rather

 
Prosternal process is beaded laterally in Pseudamara
but that bead vanishes toward tip. That is what the ventral image suggests and what my two specimens of P. arenaria clearly show under the scope. Those Wisconsin specimens were gifted to me from determiner Robert Davidson.

Richard, if you are unable to accurately key out this specimen (starting with Amara vs Pseudamara), are you planning to send it to an expert (myself included) for determination?

 
now that would be really great!!
hope this ID sticks
i've just discovered that Pseudamara is now a member of Sphodrini, i.e., essentially, is as unrelated to Amara as it gets within the subfamily(1); this explains a lot )))))))

 
nice!

 
check for elytral punctures
Richard, please check the specimen for dorsal elytral punctures and let us know if there are any. I think I may see one on the left side when I blow the image to full size, but the lighting makes it difficult to discern.

I couldn't find a matching Amara that fits this image.

 
I have it under microscope an
I have it under microscope and there is no punctures at all on the dorsal part of the elytra. there are some though at each end side or the fringe of the elytra.. wish you could have it under your eyes..

 
crossed my mind, too
actually, my very first instinct when i saw the thumbnail was Bradytus, but i've never seen any with the posterior angles this obtuse, or with such otherwise stenolophesquely styled pronotum [may mean nothing, as my experience is primarily Palaearctic]

 
I still have the specimen if
I still have the specimen if extra detailled photos are needed for id..

 
excellent
hope our expert chime in soon, with ideas & instructions!