A New Species of the Genus Argyrodes from Japan (Araneae, Theridiidae) bstract: A new species of the spider family Theridiidae is described from Japan under the name of Argyrodes nipponicus. It is closely related to Argyrodes fur and A, trigonum, but differs from these species in the shape of cephalothorax and the structure of sexual organs. The spiders of the species invade the webs of Agelena limbata and A. opulenta and rarely build their own web.

bstract Argyrodes flavescens 0. PICKARD-CAMBRIDGE, 1880 is newly recorded from Japan. The species closely resembles A. miniaceus (DOLESCHALL, 1857), but can be distinguished from the latter by the structure of female genitalia and the shape of embolus of male pale.

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