Abstract
The discovery of a fourth and new species of Timema Scudder (1895) from California, and the fifth for the genus, adds new interest to this unusual and archaic insect genus. Timema is of considerable zoogeographical interest in that it appears to be a relict member of an almost extinct fauna that was formerly widespread throughout the region of the Southwest. The advent of the desert was probably responsible for extirpation of much of this ancient fauna and today only remnants survive in Arizona. This same fauna is much more widespread in southern California.
