That there's a striped deer fly.
Family: Tabanidae
Genus: Chrysops
Wearing hats helps to deter them.
Witch hazel, peppermint, clove, lemongrass, citronella, tea tree, rosemary, eucalyptus (the usual suspects) are typical ingredients in homemade repellents. Repellant recipes
Be aware that repellents, including DEET, are notoriously ineffective against these flies.
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