Identify no-see-ums by their small size, large compound eyes, 15-segmented antennae and intricately patterned wings. No-see-ums get their famous moniker from their incredibly small size; they reach less than 1/8 of an inch in length as adults.
No-see-ums start out as white eggs that are cigar- or banana-shaped and reach just 0.25 millimeters in size. The eggs eventually turn from white to black or brown before transforming into larvae that may be up to 5 millimeters in length. No-see-ums inflict their itchy bites with their sharp cutting teeth that protrude from their elongated mandibles.
There are more than 4,000 species of no-see-ums, or Culicoides ceratopogomidae, in the world. Also known as biting midges, the bugs tend to live near bodies of water and are most active in the early morning and evening.