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Published online by Cambridge University Press: 31 May 2012
Perimones britteni (Jackson, 1913) is regarded as conspecific with, and therefore a junior synonym of, Minyriolus arenarius (Emerton, 1911). Hence, Perimones arenarius (Emerton) is Holarctic. Contrary to common usage, Walckenaera spiralis (Emerton, 1882) is not a synonym of W. vigilax (Blackwall, 1853), the former applying to a North American species and the latter to a European. Cochlembolus formicarius sp. n. is described from nests of the western thatching ant, Formica obscuripes Forel, in Washington State.