Rare term for a tiny biting fly of the family Ceratopogonidae; more commonly called 糠蚊 (ぬかか).
See also: ヌカカ
On a summer evening, I was bitten by no-see-ums and got itchy.
The derivation is uncertain; the kanji 糠 (nuka, 'rice bran') and 子 (ko, 'child') may refer to the insect's tiny size or its association with bran-like particles.