Pterostichus (Bothriopterus) trinarius (Casey) 1918  

Found in the forest in leaf litter at edge of Pond and other stoney places along the Maryland shore. The wings are reduced and the beetles are flightless. Numerous examples were collected on the Island and adjacent shores between 1904 and the present (HSB, JLW, WMM, WLM, PJS, TLE & DRW, GGP, DRW). No teneral specimens seen. The adults were collected in March, April, May, June, July and September. Hibernation probably takes place as an adult. Total length, 11.5 to 14.5 mm (13.0).

Synonyms: Pterostichus purpuratus, (LeConte), 1852; Pterostichus ohionis, Csiki, 1930