A fly unknown to the dictionaries.
1867. ‘You were brought up on a farm, were you not?’ [said Mr. Lincoln] ‘Then you know what a chin fly is.’… ‘Now,’ said Mr. Lincoln, ‘if Mr. —— has a presidential chin fly biting him, I ’m not going to knock him off, if it will only make his department go.’—F. B. Carpenter, ‘Six Months at the White House,’ p. 129, 130. (Italics in the original.)
