Identificaciones de stevecollins

ID based on conspicuous, pale-yellow hairs on first and second legs, far fewer hairs on third legs; dark nearly hairless abdomen (with only a couple of small dark hairs just visible); raised, extensive pale-yellow hairs on thorax and behind and under eyes. Also L. affinis seems be a late summer/fall species.

Similar-looking robber flies, ID'd as L. affinis here:
https://www.inaturalist.org/observations/135348555

and here: https://www.inaturalist.org/observations/60843833

Also here on BugGuide (with a note that L. affinis often lands on people, as photo'd above -- when it landed on my thigh with prey): https://bugguide.net/node/view/1725792

Prey species apparently goldenrod soldier beetle (Chauliognathus pensylvanicus).