FAMILY                      Orthomylacridae [see Durden 1969; Fossil]
GENUS                              Amblymylacris Handlirsch, 1906:782  [Fossil]
SUBGENUS                             Amblymylacris Handlirsch, 1906:782  [Fossil]
SPECIES                                 Amblymylacris clintoniana (Scudder, 1895) [Handlirsch 1906; Fossil]
SPECIES                                 Amblymylacris harei (Scudder, 1895) [Handlirsch 1906; Fossil]
SPECIES                                 Amblymylacris limulus (Handlirsch, 1920) [Durden 1984; f.g. Dipeltis ?; Fossil]
SUBGENUS                             Cursimylacris [?; Fossil]
SPECIES                                 Cursimylacris acadica (Durden, 1972) [Fossil]
                                        [=Amblymylacris acadica Durden, 1972]
SPECIES                                 Cursimylacris hendersoniana (Durden, 1972) [Fossil]
                                        [=Amblymylacris hendersoniana Durden, 1972]
SPECIES                                 Cursimylacris orieulxi (Pruvost, 1919) [Durden 1972; Fossil]
SUBGENUS                             Metachorus Handlirsch, 1906:747  [Fossil]
SPECIES                                 Metachorus imperialis (Durden, 1972) [Fossil]
                                        [=Amblymylacris imperialis Durden, 1972]
SPECIES                                 Metachorus testudo (Scudder, 1890) [Fossil]
GENUS                              Cyphomylacris Cockerell, 1927:411  [Fossil]
SPECIES                                 Cyphomylacris atrata Cockerell, 1927 [Fossil]
SPECIES                                 Cyphomylacris saclieri (Pruvost, 1919) [Durden 1972; Fossil]
GENUS                              Goniomylacris Handlirsch, 1906:778  [Fossil]
SPECIES                                 Goniomylacris pauper Handlirsch, 1906 [Fossil]
GENUS                              Mesitoblatta Handlirsch, 1906:187  [Fossil]
SPECIES                                 Mesitoblatta emersoni (Carpenter, 1934) [Durden 1969; Fossil]
SPECIES                                 Mesitoblatta latissima (Sellards, 1908) [Durden 1969; Fossil]
SPECIES                                 Mesitoblatta robusta (Sellards, 1911) [placement?; Fossil]
                                        [=Etoblattina robusta Sellards, 1911]
GENUS                              Orthomylacris Handlirsch, 1906:768  [Fossil]
SPECIES                                 Orthomylacris acadica Durden, 1972 [Fossil]
SPECIES                                 Orthomylacris analis Handlirsch, 1906 [Fossil]
SPECIES                                 Orthomylacris berryi Cockerell, 1927 [Fossil]
SPECIES                                 Orthomylacris contorta Handlirsch, 1911 [Fossil]
SPECIES                                 Orthomylacris cordiformis (Handlirsch, 1906) [Durden 1969; Fossil]
SPECIES                                 Orthomylacris franklini Cockerell, 1927 [Fossil]
SPECIES                                 Orthomylacris heeri (Scudder, 1874) [Durden 1969; Fossil]
SPECIES                                 Orthomylacris mansfieldi (Scudder, 1879) [Durden 1969; Fossil]
SPECIES                                 Orthomylacris pennsylvanica Handlirsch, 1906 [Fossil]
SPECIES                                 Orthomylacris truncatula (Handlirsch, 1906) [Durden 1969; Fossil]
GENUS                              Oxynoblatta Handlirsch, 1906:748  [Fossil]
SPECIES                                 Oxynoblatta alutacea Handlirsch, 1906 [Fossil]
SPECIES                                 Oxynoblatta vicina (Handlirsch, 1906) [Durden 1969; Fossil]
GENUS                              Paromylacris Scudder, 1885:409  [page ?; Fossil]
SPECIES                                 Paromylacris ampla Scudder, 1890 [Fossil]
SPECIES                                 Paromylacris anceps (Sellards, 1904) [placement?; Fossil]
                                        [=Blattoidea anceps Sellards, 1904]
SPECIES                                 Paromylacris diplodiscus Packard, 1885 [f. g. Dipeltis; Fossil]
SPECIES                                 Paromylacris pluteus Scudder, 1895 [Fossil]
SPECIES                                 Paromylacris rotunda Scudder, 1885 [Fossil]
SPECIES                                 Paromylacris triangularis Scudder, 1895 [Fossil]
GENUS                              Promylacris Scudder, 1885:409  [Fossil]
SPECIES                                 Promylacris ovale Scudder, 1885 [Fossil]
SPECIES                                 Promylacris rigida Scudder, 1890 [Fossil]
GENUS                              Ptilomylacris Cockerell, 1918:305  [Fossil]
SPECIES                                 Ptilomylacris medialis Cockerell, 1918 [Fossil]
GENUS                              Schistaspis [?; Fossil]
SPECIES                                 Schistaspis bretonensis Bell, 1922 [Fossil]
GENUS                              Scleromylacris [?; Fossil]
SPECIES                                 Scleromylacris linganensis Durden, 1972 [Fossil]
GENUS                              Sphenomylacris Handlirsch, 1906:782  [Fossil]
SPECIES                                 Sphenomylacris singularis Handlirsch, 1906 [Fossil]
GENUS                              Stenomylacris Handlirsch, 1906:772  [Fossil]
SPECIES                                 Stenomylacris elegans Handlirsch, 1906 [Fossil]
GENUS                              Trilophomylacris Pruvost, 1920:284  [Fossil]
SPECIES                                 Trilophomylacris americana (Scudder, 1895) [Durden 1984; Fossil]
SPECIES                                 Trilophomylacris glacialis Durden, 1972 [Fossil]
SPECIES                                 Trilophomylacris moriensis (Copeland, 1957) [Durden 1972; Fossil]