Unfortunately, I don't remember a precise time for this flight, since it's about a month since. I'm thinking she's either Tapinoma sessile or some Nylanderia species.
Anyways here's the necessary "parts" of this ID request:
Found ~4 p.m. on a humid day in the mid 70's in downtown Indianapolis
4mm length
Solid black
She's only one petiole; Definitely either formicine or dolichiderine.
(Sorry for photo quality; this is the best I could get)
These photos are definitely not high enough quality for a species ID. I just want the genus, if possible.
Edited by Martialis, June 15 2019 - 7:32 AM.