On close inspection they look normal, but they can't fly.

How do Varroa mites travel?

The varroa mite spreads from hive to hive through contact with bees from other colonies, even to colonies located several miles away. During natural and assisted reproduction and robbing, the varroa mite travels on the back of the host bee to nearby hives, where it continues to multiply and spread.

Do Varroa mites jump?

A study, published Dec. 12 in PLOS One, describes for the first time – and documents with video footage – how Varroa mites can nimbly jump from flowers onto bees. ... In managed colonies, Varroa mites are thought to spread by riding on bees when they rob weak colonies or drift between hives.