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Pterostichini? - Amara apricaria

Pterostichini? - Amara apricaria
Medford, (~25 miles east of Philadelphia, PA) Burlington County, New Jersey, USA
August 4, 2007
Size: ~8mm
haven't had time to ID this one yet, but given the 2 supraorbital seta and other general characteristics, I'll start with Pterostichini and see what happens. Suggestions welcome :)

came to UV light. montage of 14 focus-bracketed images

Images of this individual: tag all
Pterostichini? - Amara apricaria Pterostichini? - Amara apricaria



Check for it! The elytral striae well impressed and strongly punctate at the same time suggest it to me - but not one of the nominal and better known subgenus.

another look please.
Boris, the image is too dark for me to clearly see the elytral striae and punctures. I suspect that your were looking at a larger image with better resolution available to only contributing editors. At any rate, the body shape perspective reminded me more of a small Harpalus with proportionately larger heads as compared to typical Amara with smaller heads. So I would like a second look by Tim to make sure that there are indeed two setae above each eye, a finding that would surely exclude a harpaline.

Please email John VanDyk and ask for editor status. Then you will be able to view full-size images!

zooms added for now
Peter, I added a couple of zooms and tried to brighten the elytra. Let me know if there's any over views you need.

Yes, I now see two supraorbital
setae next to left eye and absence of punctures on elytral intervals. These are features that support Amara. Very similar Pseudamara has a relatively large head as suggested by image but its body size around 6 mm falls short of your 8mm. Thanks for the extra detail, but I would need to scope this one to get down to species level.

Images come closest to "Amara apricaria"
in checking what I have here in my Wisconsin reference collection. Supporting features are the slightly sinuate pronotum with hind angle denticle, image suggests a carina at that hind angle, moderately coarse punctures in elytral striae, relatively large head, pale legs, all my specimens are just under 8 mm (most 7.5 mm). Amara apricaria is relatively common, widespread, and known in NJ. This species is easy to identify under scope, but must be tentative if based on these images. If there is agreement from others, then maybe we can sign this one out as Amara apricaria.

seems to key
using Downie and Arnett, this seems to key fairly positively to A. apricaria. D&A's key characteristics (which appear to be visible in the photos (if zoomed) include "margined prosternal process, lateral basal carina separated from side margin by strong impunctate carina, scutellar stria normal, body dark, pronotum sinuate in front of hind angles; base of pronotum and at least anterior basal striae with course punctures". I, like most amateurs, like to always get to a species determination, but are there any other characteristics I can look for?

Hmm, probably . . .
In fact, I see nothing to contradict Peters ID - but am hesitant to support it nontheless, because I know not a single native American species (or any non-holarctic one, don´t know what is the case in apricaria).