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Erythraeidae balaustium
These are not clover mites (Tetranychidae: Bryobia), but are called concrete mites (Erythraeidae: Balaustium). The website listed by "PattyRose" has incorrect information... I have added a comment to that website to help correct the misconceptions therein; here is the link: http://www.omg-facts.com/Science/The-Tin...