one of several similar flies collected because I thought they were Platypezids - which one did turn out to be
No interactions present.
But love the photos and the specimen.
I find this quite often on Yarrow and Angelica at this time of year. Seems to be the common small Phasia round here; nearly all I check out are barbifrons, rather than pusilla. Nice picture!
My Flickr photos...
Lat/Lng: 51.6586, -0.1455
OS grid ref: TQ283971