Abstract
Nialoe (s. lat.) Tanaka, 1958, is one of the most taxonomically problematic subgenera within the carabid beetle genus Pterostichus Bonelli, 1810, in the Far East. Previous molecular and morphological phylogenetic analyses identified five clades comparable to subgenera within Nialoe (s. lat.), two of which have not been described taxonomically. In this study, the two remaining clades are described as new subgenera. The more ancestral of these clades is named Protonialoe subgen. nov. (type species: Pterostichus sincerus Park & Kwon, 1996). This subgenus has two autapomorphies in the female genitalia and is endemic to the Korean Peninsula. The other clade, consisting of Japanese species formerly treated as the macrogenys species group, is described as Smilodonialoe subgen. nov. (type species: Pterostichus macrogenys Bates, 1883). This subgenus has two autapomorphies in the external morphology and is distributed across eastern Honshu in the Japanese Archipelago.
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