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Ilybius biguttulus

Ilybius biguttulus
Argyle township, Lafayette County, Wisconsin, USA
August 5, 2017
Size: 11mm
Caught in solar bucket trap

Images of this individual: tag all
Ilybius biguttulus Ilybius biguttulus Ilybius biguttulus

Pardon me for asking
but is the measurement for this specimen precise or just a guess?

I used a ruler.
It's not a super accurate metric ruler but I'm confident this size is within 1/2 mm or so.

Then it could be 10,5 mm long
Because I did see many many I.biguttulus but none were that long. If the measure is more on the 11 side then, for your area, you are left with three species: I. subaeneus, I. pleuriticus and I. confusus. It would be interesting to take another look at that specimen to see if it still holds...For myself I can't say just by looking at these images.

I re-measured.
It's definitely between 10-11mm. According to Evans book on Beetles of Eastern North America this species is 8.4-11.4mm. I looked at I. pleunticus and don't see the white spots on the lower elytra in those photos that I could see. I. subaeneus and I. confusus are special concern listings here in Wisc. I'm meeting with a local beetle expert on Wed. I'll see if he can determine which species this is. Thanks for all your help.

ID confirmed
Striations on hind coxal plate and side are diagnostics. Hind margin of pronotum and head have a reddish, rather transparent margin.(1) Det Jordan Marche'

Thank you for the information!

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