Pennsylvania State University: American Cockroaches American Cockroach American Cockroaches American Cockroaches Penn State College of Agricultural Science ento.psu.edu American Cockroach Fact Sheet Peripla-neta americana Penn State University - American Cockroaches "American Cockroaches" « American Cockroaches » "American Cockroaches" Pennsylvania State University: American Cockroaches ento.psu.edu Penn State University over 3,500 known species American Cockroaches (Periplaneta americana) American Cockroaches