Geographic location of the bug: Florida
Time: 09:13 PM EDT
Your letter to the bugman: Is this a horsefly?
How you want your letter signed: uh
This is a Deer Fly, not a Horse Fly, but they are in the same family Tabanidae, so they share many similarities. We believe your individual is in the genus Chrysops, and according to BugGuide: “100 spp. in 2 subgenera in our area.” Alas, we haven’t the necessary skills to provide a conclusive species identification.