Published online by Cambridge University Press: 31 May 2012
The spider genus-group names Horodromoides Gertsch 1933, Rhysodromus Schick 1965, and Locupletus Schick 1965 are synonymized with Philodromus Walckenaer 1826. Horodromoides validus Gertsch 1933 is the sole North American member of the fuscomarginatus group of Philodromus, other representatives of the group occurring in Eurasia. Rhysodromus histrio (Latreille) 1819, Philodromus mysticus sp. n., Rhysodromus (Locupletus) alascensis (Keyserling) 1884, and one European species constitute the histrio group of Philodromus. P. lentiginosus Keyserling 1882 is synonymized with P. histrio, and Rhysodromus (Locupletus) alascensis dondalei Schick 1965 is synonymized with P. alascensis.