Definition of "pismire"

Why looke you, I am whipt and ſcourg'd with rods, Netled, and ſtung with piſmires, when I heare Of this vile polititian, Bullingbrooke,

c. 1597 (date written), William Shakespeare, “The First Part of Henry the Fourth, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene iii]

Much there is not of wonder in the confused Houses of Pismires, though much in their busie life and actions […]

1658, Sir Thomas Browne, The Garden of Cyrus, Folio Society, published 2007, page 189

We are scurrying emmets or pismires with our sad little comedies.

1993, Anthony Burgess, A Dead Man in Deptford