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Photo#262058
Noteridae? - Matus bicarinatus

Noteridae? - Matus bicarinatus
Groton, Middlesex County, Massachusetts, USA
March 29, 2009
Size: 9mm

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Noteridae? - Matus bicarinatus Noteridae? - Matus bicarinatus Noteridae? - Matus bicarinatus

Moved
Moved from Matus.

Matus bicarinatus
it is.

Moved
Moved from Beetles.

Unlikely
Looks like another dytiscid, maybe new to the guide..Although there are 5 visible pro and mesotarsal segments, this seems to be on the large side for a Noterid and there is a visible scutellum, making this either a Colymbetine or Dytiscinine...but before I make another embarrassing blunder like on your previous specimen, let me check the references to be sure.

 
Definitely dytiscid
genus is Matus, which is in the guide. It's either M. bicarinatus or M. ovatus but need microscopic examination of the underside microsculpture to differentiate.

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