Dark brown to black, shiny and very flattened, leathery front wings, long flexible antennae. These cockroaches measure between 1 and 1.5 inches in length. Oriental cockroaches can be distinguished from others as they are shiny dark brown or black in color. One feature that this type of cockroach has that may distinguish it from others is wings, though they are not functional. They are usually found in damp areas.
The females of this species have smaller wings than the male counterparts. The younger oriental cockroaches or nymphs are usually darker in colour and do not have wings, so may be mistaken for another kind of cockroach. The females will carry an egg case protruding from the abdomen for up to five days, and then it will hide the egg case in or near food or water. The egg case is about one inch long, is reddish in color, and often appears as though it has air in it. The baby cockroaches will emerge in about 60 days and will be fully developed in about a year. Once the oriental roach reaches adulthood, it can live for up to six months.
They feed on garbage and decaying plant and animal products. Usually the oriental roach will be found in basements, crawl spaces, in or around drains, under refrigerators, in sinks, washing machines, under floors, and even inside walls.
The oriental roach is known to cause food poisoning, diarrhea, asthma, as well as dysentery.
These cockroaches are extremely invasive finding their way in through cracks in the foundation, sewer pipes, and other entryways and leaving a scent trail for other roaches. One egg case can hold up to 18 baby cockroaches, so infestation can occur fairly rapidly.
Curing the problem means finding the breeding areas, if they are accessible, and also treatment with insecticides. Making sure that a residual insecticide is kept active so that any nymphs hatching out do so straight onto an insecticidal surface. You will need to contact a pest control company to properly eradicate them.