Heart O' the Hills Area, Olympic National Park, Clallam County, Washington, USA July 18, 2006
Here's a figure I made showing the parts of a fly antenna. This image is a tachinid fly.
Source for names, which includes images for various fly groups: http://www.ento.csiro.au/biology/fly/fly.html#
Contributed by Stephen Hart on 4 January, 2019 - 5:25pm