Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 164.

Luleå Lappmark [2], 28/07/1732, ¶900:

They were particularly troublesome because they crawled all over the face and entered the nose, mouth and eyes. When they were about to bite they did not budge however hard one blew at them. “Mockere” in Lappish, very small head. Called “knort” by the Swedes. They covered linen clothes in such enormous numbers that they made them completely black and it was impossible to brush them off.