muck fly

plural muck flies

1. obsoleteA fly found on, or associated with, dirt or dung.

   Less appetizing were the hordes of green, shiny muck-flies which were to be found all over the island, even amid the thickest tussock.

   1940, Erling Christophersen, translated by RL Benham, Tristan da Cunha, The Lonely Isle, page 200

   1 more example

   [T]he naturalist […] next appealed to the patron's approbation for a curious disquisition he had made, touching the procreation of muck flies, in which he had laid down a curious method of collecting, preserving and hatching the eggs of these insects, even in the winter, by certain modifications of artificial heat.

   1751, Tobias Smollett, chapter 103, in The Adventures of Peregrine Pickle, volume IV