Pterostichus (Nialoe) asahinus Habu & Baba, 1960

Figs 2D, 4M-P, 6F-H

Materials examined.

1♂, Momoyake, alt. 1030 m, Yurihonjô-shi, Akita Prefecture, Japan (MGRS: 54 SVJ26680 29227; 39.1091115°N, 140.15197046°E), 24. vi-15. vii. 2021, subterranean baited trap, Y. Mitsuduka leg.

Notes.

The body lengths (mm) of the specimen are BLm 16.38, BLl 14.60 and BLc 14.06. This specimen was collected together with P. chokaisanus, which is to be recorded below. This is the first report of the sympatric occurrence of this species pair and provides evidence that they are reproductively isolated distinct species. Although the comparison was based on a single male for each species, a body-size difference was observed between the two species, with P. asahinus larger than P. chokaisanus . This collection record is the northernmost distribution record of the species and the first record for Akita Prefecture.