Which of the following roaches is uniformly dark in color?

The smoky brown roach is characterized by its uniformly dark color, which typically appears as a glossy, mahogany or dark brown shade. This distinctive coloration helps in identifying it among other roach species, as the smoky brown roach lacks the lighter markings or variations in color that other types might display.

For example, the field cockroach tends to have a more varied coloration with lighter and darker shades, while the American roach often features distinct yellowish-brown markings on the pronotum. The Turkestan roach may exhibit a paler overall color, missing the uniformly dark characteristics of the smoky brown roach. Therefore, the smoky brown roach stands out due to its solid dark appearance, making it easily identifiable in various environments.