Several different species of cockroaches inhabit the New England area. The life cycles of all of these species are similar.. All cockroaches begin as eggs, which hatch into nymphs, and develop into adults over varying lengths of time. Adult female cockroaches start the reproductive cycle by laying multiple eggs housed within a single, protective ootheca, or case. Typically ranging from five to 10 millimeters long, cockroach egg cases are easily visible to the naked eye and generally resemble kidney beans in shape. Each case contains an of average of 16 to 37 eggs, with the prolific German cockroach often producing up to 40 eggs at a time. Though large enough to be seen, egg cases frequently escape human detection, as female cockroaches either carry the oothecae until just before the eggs hatch (German cockroaches) or lay the capsules in sheltered areas like cracks, crevices, and debris on the floor. Brown-banded cockroaches even glue their egg cases to ceilings, doors, picture frames, and the undersides of furniture.