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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Adephaga » Ground Beetles (Carabidae) » Harpalinae » Pterostichitae » Chlaeniini » Vivid Metallic Ground Beetles (Chlaenius) » subgenus Chlaeniellus (Chlaenius subgenus Chlaeniellus) » pennsylvanicus group (Chlaenius pennsylvanicus group) » Say's Ground Beetle (Chlaenius pennsylvanicus) » Chlaenius pennsylvanicus pennsylvanicus
Photo#246814
Chlaenius - Chlaenius pennsylvanicus - male
Copyright © 2008 Tim Moyer

Chlaenius - Chlaenius pennsylvanicus - Male
Medford, (~25 miles east of Philadelphia, PA) Burlington County, New Jersey, USA
June 1, 2008
Size: ~12mm
wish I had shot this one more top-down, but a nice green one. Might be C. impunctifrons Say?
came to UV light

Images of this individual: tag all
Chlaenius - Chlaenius pennsylvanicus - male Chlaenius - Chlaenius pennsylvanicus - male
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Contributed by Tim Moyer on 29 December, 2008 - 12:52pm
Last updated 17 February, 2014 - 7:08pm

Moved
Moved from Say's Ground Beetle.
… v belov, 17 February, 2014 - 7:08pm login or register to post comments

Chlaenius pensylvanicus Say
i'm pretty confident
IMPORTANT NOTE: A typo in D&A key for Agostenus (p.164) mislead you: in the very first couplet, the ‘–’ part (“tip of prosternum not margined…”) should refer to couplet 6, not 5!!! Took me a few min to figure it out. Another horrible error fooled me much longer: in couplet 1 of the Chlaenius s.str. key (p.163), references ‘2’ and ‘4’ should be switched, i.e. ‘abdominal sclerites smooth…’ is supposed to send you to couplet 4 rather than 2...
go figure...

Moved from Vivid Metallic Ground Beetles.
… v belov, 12 May, 2009 - 4:53am login or register to post comments

 
Yes,
relative antennomere lengths and dorsal color is consistent with C. pennsylvanicus. I just didn't feel as comfortable as you without seeing perpendicular view of head, labrum, and pronotum. Couplet #1 under Chlaenius s. str. is correct. Better wording would have been:

1. Abdominal sclerites glabrous medially or at least distinctly less pubescent compared to lateral portions...

- Abdominal sclerites uniformly punctate/setose...

Angularity of humeral angle is perhaps a more observable and reliable character which is also addressed in couplet #1.

Finally, double "nn" in "pennsylvanicus" is the correct spelling for this species. BugGuide page should be corrected.
… Peter W. Messer, 12 May, 2009 - 2:36pm login or register to post comments

 
thanks, Peter
n inserted
… v belov, 12 May, 2009 - 3:12pm login or register to post comments

Chlaenius
is safest level in my opinion as the unfortunate oblique view of dorsum prevents me from seeing the true shape of the taxonomically-important pronotum. An exact perpendicular dorsal view is most helpful.
… Peter W. Messer, 11 May, 2009 - 6:58pm login or register to post comments

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