 The female "Parcoblatta bolliana" is the only other female of the genus "Parcoblatta" that has such significantly reduced tegmina and absence of hind wings.The female "P. bolliana" is distinguished from "P. americana" by its compact form, space between its compound eyes less than the space between its antennal sockets, its tegmina having few traces of venation, and its supra-anal plate weakly produced with its side edges converging to a broadly rounded apex, while the "P. americana" having a normal, less compact form, space between its compound eyes noticeably wider than the space between its antennal sockets, its tegmina have visible venation, its supra-anal plate is normally produced with its side edges converging to a sharply rounded apex.The species is known in Mexico and the western United States, including Oregon, California, Nevada, and Arizona.