Thermobia domestica (Packard), is quite similar in habits but is generally darker in color. The firebrat prefers temperatures over 90 degrees F but has a similar high humidity requirement. It is common near heating pipes, fireplaces, ovens and other heat sources.
Silverfish are always wingless and are silvery to brown in color because their bodies are covered with fine scales. They are generally soft bodied. Adults are up to 3/4 inch long, flattened from top to bottom, elongated and oval in shape, have three long tail projections and two long antennae.