Which roach is specifically noted for always being male when found indoors?

The Pennsylvania woods roach is noted for the unique characteristic that only males are typically found indoors. This species tends to reside outside in wooded areas, and males may be attracted to indoor environments due to factors such as light or warmth. The male Pennsylvania woods roach is distinguished by its wings and the fact that it can fly, which is less common among other cockroach species that are typically present indoors.

In contrast, other species like the brown-banded roach, smokey brown roach, and German roach have both males and females that can be found indoors, and they possess different habits and habitats. The indoor presence of those species is largely due to their adaptability to living in human dwellings, which is not the case for the Pennsylvania woods roach. Thus, when considering the specific behavior of indoor presence among the species listed, the Pennsylvania woods roach stands out due to the singularity of its male-only indoor population.