The Spring Usher is very variable in color, at least the male.
The color can vary from dirty white to brown to dark gray.
The females of the Sping Ushers are also completely wingless and look like large spiders.

Flight time starts around mid-January (except during extreme cold) and ends mid-March, although some are still occasionally seen in April.

Caught in my self made moth trap.

In my yard, Hilversum, The Netherlands, 22 February 2021