I’m assuming this is the excerpt:
"I got there it was all still and Sunday-like, and hot and sunshiny—the hands was gone to the fields; and there was them kind of faint dronings of bugs and flies in the air that makes it seem so lonesome and like everybody’s dead and gone…" The figurative language used is:
b. personification
In the excerpt, the bugs and flies were personified to be droning in the air. Personification is when nonhuman subjects are given humane attributes.