Tiny Splinter-Shaped Biting Insects Outdoors: Thrips, Harmless but Annoying

The "tiny splinter," rust-colored, larger than a pencil point, longer than a bird mite, that bites but doesn't embed—is a thrips (Thysanoptera). Also called "thunderflies" or "storm flies."

Thrips Facts

• Slender, 1–2 mm, fringed wings (often unseen), rasping-sucking mouthparts.
• Primarily plant feeders (flowers, leaves, buds). Some species bite humans opportunistically—especially in late summer, light colors attract them.
• Bites are sharp, stinging, but harmless—no venom, no disease, no lasting mark.
• Common on light clothing (white tank top = beacon).

Management

• Wear dark colors outdoors during peak thrips season (July–Sept).
• Insect repellent (DEET, picaridin) may deter them.
• No yard treatment needed—they're ubiquitous, transient, and beneficial (some eat spider mites).

See livingwithbugs.com/thrips.html for close-up photos. You described them perfectly.