Genus Abacion Rafinesque, 1820

Abacion Rafinesque, 1820, Annals of Nature, 1: 9. Type species: A. tesselatum Rafinesque, 1820, by monotypy. Hoffman & Crabill, 1953, Florida Entomol., 36: 81. Chamberlin & Hoffman, 1958, Bull. U.S. Natl. Mus., 212: 108. Shelley, 1984, Can. J. Zool., 62: 981 (revision).

Spirostrephon Brandt, 1840, Rec. Mém. relat. ord. Ins. Myriapodes: 90. Type species: Julus lactarius Say, 1821, by monotypy. Loomis, 1937, Proc. U.S. Natl. Mus. Wash., 84 (3006): 105. Synonymy proposed by Hoffman & Crabill (1953).

Reasia Gray, 1843, in: Jones, T. (R. Todd ed.): Cycl. Anat. Phys., 3: 546. Type species: R. spinosa Sager, 1856, by monotypy. Synonymy proposed by Wood (1865).

Platops Newport, 1844, Ann. Mag. Nat. Hist., Ser. 1, 13: 267. Type species: P. rugulosa Newport, 1844, by subsequent designation by Cook, 1895. Synonymized with Spirostrephon by Cook (1895).

Platyops Agassiz, 1846, Nomenclatoris zoologici Index universalis: 294, 296. Type species: Platops rugulosa Newport, 1844, by direct substitution.

Five species, United States east of the 100th Meridian; northern Mexico.