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black ant - Leptothorax

black ant - Leptothorax
Bethlehem, Coos County, New Hampshire, USA
April 10, 2006
Size: 4mm
It looks to me that it's a good match with the other one I already had identified in the guide.

From a closely related...
but different Genus. This one worker is a "true" Leptothorax, as shown by its more parallel-sided head, dull rather than shining head and alitrunk (petioles included), and last but not least eleven (rather than twelve) antennal segments.

Now that you point it out
I see the differences, but boy are they close. Thanks Richard.

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