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 Rowlandesmus millicoma Shear & Marek , n. sp. Figs 85–90 , 131 Types. Male holotype and male and female paratypes from 14 mi. E, 2 mi. S of Allegany , Weyerhauser Millicoma Tree Farm , company Road 6000, riparian zone of Fall Creek , 43.3983°, -123.7770°, Coos Co. , Oregon , collected 23 November 1971 by E. M. Benedict. All types deposited in CAS . Diagnosis. Distinct from R. dentogonopus in lacking prominent teeth in the terminal zone of the gonopod and in the more basal position and larger extent of the pulvillus ( p, Fig. 90 ). Etymology. The species name is a noun in apposition and refers to the type locality, the Millicoma Tree Farm. Description. Male holotype . Length about 3.5 mm , greatest width 0.45 mm . Head densely setose, cuticle alveolate ( Fig. 85 ). Collum with anterior marginal row of 20 setae ( Fig 85 ). Anterior metazonites with three rows of setae, transitioning to four rows about ring 5, setal tubercles low on anterior segments, becoming almost obsolete on midbody ( Fig. 86 ) to posterior rings; some rings with interpolated setae nearly forming fifth row. Alveolate cuticle absent from metazonites posterior to collum. Epiproct ( Fig. 87 ) swollen, short, decurved, lacking alveolate cuticle. Anterior legs crassate, tarsi with sphaerotrichomes. Femur of third leg slightly enlarged. Gonopod ( Figs 88–90 , 131 ) with moderately inflated prefemorite. Acropodite short, robust. Pulvillus ( p, Figs 88, 90 ) basal, enlarged, pulvillar process absent. Terminal zone bifurcate, longer distal process ( z, Fig. 88 ) narrow at base, then broadened, bent posteriorly at slightly less than right angle, crossing lateral to shorter basal process ( x, Fig. 88 ). Females similar to males in nonsexual characters. Distribution. Coos Co., Oregon . Records: OREGON : Coos Co. : 11 mi east, 4 mi south of Allegany, Weyerhauser Millicoma Tree Farm, company road 6040, 43.3429°, -123.8435°, 21 November 1971 , E. M. Benedict, mm; 6 mi east, 2 mi south of Allegany, Weyerhauser Millicoma Tree Farm, company road 5000, 43.3944°, -123.9111°, 20 November 1971 , E. M. Benedict, m, f; 6 mi east of Allegany, Game Commission cabin, 43.4311°, -123.9094°, 20 November 1971 , E. M. Benedict, mm.