Three new genera and eighteen new species of miniature polydesmid millipedes from the northwestern United States (Diplopoda, Polydesmida, Polydesmidae) Author Shear, William A. Professor Emeritus, Department of Biology, Hampden-Sydney College, Hampden-Sydney VA 23943; present address 1950 Price Drive, Farmville VA 23901. Author Marek, Paul E. 0000-0002-7048-2514 Associate Professor, Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061. pmarek @ vt. edu; https: // orcid. org / 0000 - 0002 - 7048 - 2514 pmarek@vt.edu text Zootaxa 2021 2021-05-24 4975 1 81 126 journal article 6194 10.11646/zootaxa.4975.1.3 529d48db-4299-4e2d-9aaf-6c4178c08b18 1175-5326 4804909 DB7C9028-3EDF-454F-88D0-336624AD1DC4 Bidentogon buttensis Shear & Marek , new species Figs 13–16 Type. Male holotype from near Stringtown Hill , NE of Oroville , Butte Co. , California , collected 9 February 1956 by R . O. Schuster , deposited in the Florida State Collection of Arthropods , Gainesville , Florida . The dissected holotype is mounted on SEM stub WS33-9, deposited in CAS . Diagnosis. The solenomere ( sm , Fig. 16 ) is short and has a low tooth subdistally, nearly appearing bifid; the short terminal zone ( tz, Fig. 16 ) is slightly expanded and also has a low subterminal tooth. There are 16 setae in the anterior marginal row of the collum ( Fig. 13 ). Etymology. The species name, an adjective, is from the type locality in Butte Co., California . Description. Male holotype . Length about 5–6 mm , maximum width 0.7 mm . Nonsexual characters typical for the genus. Femora of third legpair expanded, nearly spherical. Gonopod prefemora typically flattened ( pf, Fig. 15 ). Acropodite ( ac, Fig. 15 ) short, distally broadened, solenomere curved, nearly as long as terminal zone. Terminal zone with very low subterminal tooth. Females unknown. Distribution. Known only from the type locality.