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Photo#353846
furrowed pronotum carabid - Acupalpus indistinctus

furrowed pronotum carabid - Acupalpus indistinctus
Medford, (~25 miles east of Philadelphia, PA) Burlington County, New Jersey, USA
June 11, 2007
Size: ~3.8mm
images using improved technique added for better detail (still, lighting this beetle proved very difficult for me).
I still can't determine this beetle. Appears to key (using D&A and Am Beetles) to Acupalpus (starting from Halpalini), based on 1) labial palpi with 2-3 setae, 2) mentum w/o tooth, 3) elytra with marginal series of punctures not grouped in 2 groups of 4. But no species of Acupalpus from D&A appears to match, nor does any have any mention of a pronotum with furrows like this one.

therefore, suggestions welcome, as always :)

Images of this individual: tag all
furrowed pronotum carabid - Acupalpus indistinctus furrowed pronotum carabid - Acupalpus indistinctus furrowed pronotum carabid - Acupalpus indistinctus furrowed pronotum carabid - Acupalpus indistinctus furrowed pronotum carabid - Acupalpus indistinctus

Moved
Moved from Stenolophina.

might be a fluke as well--
...like a developmental defect of some nature. these are not uncommon and sometimes distort a familiar gestalt big time...
i'll ask Peter to weigh in

 
Departures from typical Acupalpus indistinctus.
Of my 16 reference specimens of Acupalpus indistinctus taken from the same area (Ozaukee Co, WI), one is almost uniformly shiny black on dorsum except for vague less dark areas at elytral shoulders and pronotal base. Tim's April 18th specimen from same locality is typical of the dorsal coloration. The proportionately large head and bulging eyes certainly fits this species. Another departure: The transverse furrows on pronotum are likely congenital abnormalities that I've seen rarely in other carabid cases.

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