DCHP-1 Online
no-see-em (fly) Informal 
n. a tiny winged insect, Culicoides sp., that has a nasty bite; also, sometimes a sandfly.
- 1903 The midge, again, or punkie, or "no-see-'um," just as you please, swarms down upon you suddenly and with commendable vigour, so that you feel as though red-hot pepper were being sprinkled on your bare skin. . . .
- 1928 The needle-prick of an unobtrusive "no-see-um" reminded that the season of the venomous little sand-fly was not yet over.
- 1957 But we had plenty of company, both in the form of humans and no-see-em flies.
- 1964 For quite a long way after that the going was downhill, but near the bottom we struck swampy ground, a paradise for no-see-'ems, those minute flies whose burning bites are inversely related to their size.
- 1903 The midge, again, or punkie, or "no-see-'um," just as you please, swarms down upon you suddenly and with commendable vigour, so that you feel as though red-hot pepper were being sprinkled on your bare skin. . . .