Males Mummy Wolf Spiders are black with a grey/white median stripe.
The female is brown with a light brown median stripe.
It is a small spider (5 to 7 mm) which occurs in great numbers on the leaf litter of deciduous woodlands all over Europe.

1st & 2nd photo: In my yard, Hilversum, The Netherlands, 19 May 2013
3rd photo: Stulpheide, Lage Vuursche, The Netherlands, 5 June 2013