Gray wall because this species often found on grey wall with plenty of sunshine.

Menemerus bivittatus is commonly known as the grey wall jumper. It is a pantropical species and is usually found on the walls of buildings or on tree trunks where it stalks its prey.

Here in this image on the left, this male Menemerus bivittatus is  found in a grey wall where it successfully captured a pray.

Looking on at the left is the lady cleaner of the toilet with the grey wall.