A pest of warm and steamy environments such as commercial kitchens, breweries, milk dairies and heating ducts in large or multiple occupancy buildings. The adult is 10-15mm long, yellow/brown in colour. Both sexes have well developed wings but do not normally fly. Flight requires warm conditions.
They take harbourage in shallow cracks and crevices, behind tiles etc in warm areas close to a water source. Often enter electrical equipment, sockets and machinery. Can climb smooth surfaces.
The adult is 20-24mm long, dark brown to almost black. They can climb rough but not smooth surfaces. They are relatively cold-tolerant and can be found out of doors in the summer around air bricks and drains of infested premises.