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Conopid fly? - female

Conopid fly? - Female
Gainesville, University of Florida, Alachua County, Florida, USA
April 20, 2018
Size: Approx. 2 cm
Found resting briefly on a boardwalk over a wetland. Almost had me fooled for a wasp, before I noticed the halteres.

Appears to be a new (undescribed) Polybiomyia!
The very short antennifer indicates either Polybiomyia or Sphiximorpha, and the remarkably narrow & elongate abdominal "waist" suggests the former...though to be certain, one would have to check the "complete post-metacoxal bridge" character (either by collecting a specimen, or catching & chilling one long enough to examine its sternum with a hand lens or microscope). After reading your BG bio, Jeff, as a forest entomologist I'm sure you have collection skills. This appears to be a new taxon, and likely rare.

This is a female, from the dichoptic eyes. Note that a male has been posted on iNaturalist, from very nearby to yours here, that appears to match this both the short antennifer and long & narrowly petiolate well as in the infuscation of basal 2/3 of the posterior portion of the wing, which is unusual in nearctic Cerioidini.

Florida already has a long & narrowly petiolate fact, it's a Florida endemic and our only nearctic species of that large genus. And Florida also has an apparently endemic but unpublished Sphiximorpha.

Your post here, and the associated male iNat post, appear to represent a new Florida endemic for Polybiomyia as well! :-)

Very cool, sorry that I missed this comment before. I'm in that area frequently, and I'll look out for any opportunities to collect one of these guys.

Moved from Syrphid Flies.

great find, likely a Sphiximo
great find, likely a Sphiximorpha, but I have never seen this beautiful species!

Moved from ID Request.

Female - Syrphid Fly
Eye-gap = ♀
Interesting, this might be something new in the tribe Cerioidini.

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