bottleflies

So mild and pleasant is this climate that the majority of the paupers creep out, like the blue bottleflies, with the coming of spring, preferring to sleep in barns or under the green trees all the summer, rather than endure the hard beds, discipline and regular habits of the Almshouse.

Lippincott's Magazine of Popular Literature and Science Volume 12, No. 28, July, 1873 Various

But you can ruin him because he's an atheist, or because somebody sued him, or because he slept with some woman, or because he pulls wings off bottleflies.

The Fountainhead Rand, Ayn 1943