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Photo#174493
Predacious Diving Beetle - Dytiscus carolinus

Predacious Diving Beetle - Dytiscus carolinus
Groton, Middlesex County, Massachusetts, USA
March 27, 2008
Size: 25mm

Images of this individual: tag all
Predacious Diving Beetle - Dytiscus carolinus Predacious Diving Beetle - Dytiscus carolinus Predacious Diving Beetle - Dytiscus carolinus

Moved
Moved from Dytiscus.

D. verticalis?
based on the color of the pronotal margins (BG images)

 
Looks like a good match
but it seems to be about 10mm small for D. verticalis.

 
Then must be D. carolinus
Based on DJ Larson's key to species (2001 publication on Neartic Dysticidae). Size is about right (22-27 mm), abdominal sterna colouration reddish to black and elytra with no yellow subapical transverse fascia. Range: From S. Wisconsin to Alabama. New species to the guide!

 
Tim,
Looking at the other Dytiscus in the guide, D. fasciventris looks like a possibility too.

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