Acritus acaroides is a species of clown beetle in the family Histeridae and tribe Acritini. It ranges in size from 0.9-1.1mm, very rarely reaching 2mm. It is found in North America, roughly from eastern Texas to South Carolina.
Further reading
Book: Catalogue of Palaearctic Coleoptera, Volume 2: Hydrophiloidea - Staphylinoidea. 2015. Lobl . I.. Smetana . A.. Apollo Books. 978-90-04-29685-5.