backswimmers

It is hoped that unlike other repellents, which require to be used all over the body and can damage clothing, smaller amounts of repellents based on chemicals released by backswimmers could keep mosquitoes at bay.

Telegraph.co.uk: news, business, sport, the Daily Telegraph newspaper, Sunday Telegraph 2010

"Looking down, she could see schools of streamlined, multi-legged backswimmers riding the wake generated by her mount.

The Cat is a Metaphor 2010