Multiple females were observed on open sandy soil between Larrea and Ambrosia shrubs, during late morning.
The absence of pale appressed setae on the vertex and pronotum dorsum, combined with the pale setae of the legs match the description of T. williamsi in Krombein and Schuster 1957 well.
Larger specimen was about the size of my palm across.
I also have a video of it making paper (probably) (will upload later)