SUMMARY This paper deals with a revision of the British species of the subfamily Aceosejinae together with a synonymic list of the species of the subfamily. Keys are given for the separation of genera and species of the British aceosejines. The following new synonymy is introduced: Arctoseiulus Willmann and Arctotarseius Willmann are synonyms of Arctoseius Sig Thor. Arctoseiodes Willmann is a synonym of Leioseius Berlese. Seiopsis Berlese, Jordensia Oudemans and Blattilaelaps Womersley are synonyms of Proctolaelaps Berlese. Garmania Nesbitt and Paragarmania Nesbitt are synonyms of Melichares Hering. Arctoseiopsis Evans is a synonym of Iphidozercon Berlese. Aceosejus Sellnick is a synonym of Lasioseius Berlese. Lasioseius (L.)innumerabilis Berlese, Lasioseius alpinus Schweizer and Lasioseius ventritrichosus Schweizer are synonyms of Hypoaspis hypudaei Oudemans. Typhlodromus domesticus Oudemans is a synonym of Melichares agilis Hering. Typhlodromus tineivorus Oudemans, Blattisocius triodons Keegan and Lasioseius similis Schweizer are synonyms of Lasioseius (L.) tarsalis Berlese. Lasioseius fimbriatus Halbert and Seiulus amboinensis Oudemans are synonyms of Lasioseius (L.) dentriticus Berlese. Laelaps ligoniformis Michael is a synonym of Sejus muricatus C. L. Koch. Arctoseius austriacus Willmann is a synonym of Gamasellus (Sessiluncus) eremitu Berlese.
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G. O. Evans (1958) studied this question.
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