Subject: LARGE WEIRD LOOKING FLY
Geographic location of the bug: S.E. PA.
Time: 02:31 PM EDT
Your letter to the bugman: IN ALL MY 72 YEARS AND QWORLD TRAVELS, I HAVE NEVER SEEN THIS ONE . . . . LOOKS LIKE A LARGE HORSEFLY
How you want your letter signed: HAL SLACKWAY
You are absolutely correct that this is a Horse Fly. More specifically it is a Black Horse Fly, Tabanus atratus, and the large close set eyes indicate it is a male. Despite its size, only female Horse Flies bite and feed on blood. This male is perfectly harmless.