---

A tricky genus: I've read through "A world review of the bee fly tribe Usiini (Diptera, Bombyliidae) — Part 3: Parageron Paramonov s. lat." by David Gibbs, 2023. Parageron gratus and incisus are now Protypusia grata and incisia.
Following the key your female seems to be Protypusia grata indeed as the hairs on front are blackish to brown while incisa's are silky white and shorter. And even the end of March would be quite early for incisa.
Sizes: grata 2.3-7.5, incisa 8.0 - 10.0

EDIT: + straight vein R4 at apex!