In this paper a new species Tetragnatha shinanoensis is described from Japan. The new species is known only from mountainous regions of Minami-azumi-gun, Nagano Pref. Biological observation of this new spider is also presented.
Spiders of the genus Hygrolycosa have hitherto been known to occur sporadically in the world, but not in Japan. Recently, however, a first representative of this genus in Japan was found. Its description is given here as a new species.