Two new species and new records of the ground beetle subgenus Falcinebria Ledoux Roux, 2005 (Coleoptera, Carabidae, Nebria) from Tohoku District, northern Honshu, Japan

Key Points

• This research aims to identify new species and records of the Falcinebria subgenus in Japan.
• Describes two new species of Falcinebria from Tohoku District, Japan.
• Reports new collection records for existing species.
• Sedimentary analysis from specified localities within Iwate and Akita.
• Two new species, N. hayachinensis and N. yuda, were discovered.
• Found the northernmost collection of N. niohozana and southernmost for N. sagittata.
• Enhanced understanding of the geographical distribution and diversity of the Falcinebria subgenus.