Distribution of the Pterostichus macrogenys species group in northern Chubu, northern Kanto, and southern Tohoku Districts, Honshu, based on specimens with unambiguous identities, modified from Sasakawa et al. (2020) and Sato (2021) 1 P. chokaisanus Sasakawa, 2009 2 P. kurikomasanus Sasakawa, 2005 3 P. asahinus Habu and Baba, 1960 4 P. takadateyamanus Sasakawa, 2009 5 P. adatarasanus Sasakawa, 2005 6 P. gassanus Sasakawa, 2009 7 P. shinbodakensis Sasakawa & Itô, 2017 8 P. awashimaensis sp. nov. 9 P. iwakiensis Sasakawa, 2009 10 P. eboshiyamanus Sasakawa, 2009 11 P. tateishiyamanus Sasakawa & Itô, 2017 12 P. monolineatus Sasakawa, Mitsuduka, & Itô, 2020 13 P. yamizosanus Sasakawa, 2005 14 P. yahikosanus Sasakawa, 2009 15 P. ohsawacavus Sasakawa, 2005 16 P. sumondakensis Sasakawa, 2005 17 P. isolatus Sasakawa, 2005 18 P. nakamiyorinus Morita, Ohkawa & Kurihara, 2013 19 P. momuranus Morita, Ohkawa & Kurihara, 2013 20 P. macrogenys Bates, 1883 21 P. nagasawai Ito & Ogai, 2015. Red letters denote the type localities of each species. The blue letter indicates where the male specimen of P. asahinus newly examined here was collected.