German cockroaches have __________?

German cockroaches are characterized by a distinct appearance that includes two parallel dark stripes running down their thorax. This feature is a key identifying trait that helps differentiate them from other species of cockroaches. The stripes usually appear light brown or tan against their more golden-brown bodies, making them easily recognizable. This specific coloration and patterning contribute to their identification in both pest control situations and biological studies.

In contrast, solid black coloration, red coloration, or lack of markings do not correspond with the observed characteristics of German cockroaches, thus highlighting why the presence of two stripes is the defining trait in this context.