The forest cockroach is between 7 and 11 millimetres long. The forewings of the male cover its whole body, tapering at the rear. Females have shorter wings that only partially cover the abdomen. Forest cockroaches are brown or yellowish in colour, with a dark brown pronotum (the plate-like structure covering the thorax).
Male forest cockroaches can be found mainly in trees, bushes and grass, among twigs and plants. Females typically hide beneath the forest litter or in moss. Forest cockroaches winter as larvae and emerge in spring as adults. They are common throughout Eurasia.
These cockroaches typically feed on lichens, moss and dry foliage.