Nipponentomon pembertonense is described from Pemberton Historical Park, Maryland. This new species differs from other Nipponentomon spp. in the following combination of characters: 9 anterior setae on abdominal sternite VII, 15 posterior setae on abdominal tergite VIII, cover of tergite VIII gland with posterior row of teeth only, female acrostylus entire and narrowly rounded, foretarsal claw flaps rudimentary and in distal half of claw, foretarsal sensillum c′ reaching base of claw. In several specimens, the ducts and tubes connected to pores on the foretarsus were visible and could be traced at least partially. The most basal pore and the pore at the base of the claw were connected to a common tube complex with a terminal sac. Ducts and tubes also were observed connected to pores near sensillum t3 and just posterior to the empodium.

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