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Shallow subterranean environments have recently received attention as a habitat for   Carabidae   beetles, and many new species have been discovered using collection techniques devised for this habitat. We report the discovery of two new species of themacrogenys    species group of the   Pterostichus   subgenus   Nialoe   Tanaka, 1958, collected by subterranean baited traps in northern Honshu, Japan.    Pterostichus   shinbodakensis    Sasakawa &amp; Itô,  sp. n.  is described from Mt. Shinbodake, Niigata Prefecture, and    P.   tateishiyamanus    Sasakawa &amp; Itô,  sp. n.  is described from the southeastern foot of Mt. Tateishiyama, Fukushima Prefecture. Comparative male genital morphology shows that among the known species, the two new species are most closely related to    P.   falcispinus    Sasakawa, 2005 and    P.   chokaisanus    Sasakawa, 2009, respectively. In addition, sympatric occurrence of    P.   shinbodakensis    with a smaller, unidentified species of the species group was also confirmed. The implications of these results for future studies of themacrogenys    species group, as well as those of    Nialoe   , are discussed.

subterranean biology

Two new species of the    Pterostichus   macrogenys    species group (  Coleoptera  ,   Carabidae  ) discovered in shallow subterranean habitats in northern Honshu, Japan