German cockroach, Blattella germanica. From left to right: adult male, adult female, nymph. Ootheca (egg case) below.

German cockroach, <i>Blattella germanica</i>. From left to right: adult male, adult female, nymph. Ootheca (egg case) below. Vertical line indicates one inch.; Riverside, CA Credit: Dong-Hwan Choe
Credit: Dong-Hwan Choe