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Mimuloria Chamberlin 1928 is revived from synonymy under Nannaria Chamberlin 1918a for Nannariini (Polydesmida: Xystodesmidae) with simple but apically ornamented gonopodal acropodites that arch or lean mediad and cross body midlines and opposing acropodites in situ. It encompasses two assemblages based primarily on the nature of the ornamentations, the castanea and dilatata species groups. The former includes three established species [M. castanea (McNeill 1887) M. missouriensis Chamberlin 1928 and M. davidcauseyi (Causey 1950a)], and the latter contains two new ones (M. dilatata [M. d. dilatata, M. d. sigmoidea], and M.
rhysodesmoides). Castanaria Causey 1950b is returned to synonymy under Mimuloria, and C. depalmai Causey 1950b is placed under M. castanea, thereby constituting a new synonymy. The fi rst illustrations of the holotype gonopods of Fontaria oblonga C. L. Koch 1847 and N. minor Chamberlin 1918a unequivocally establish their identities, and the convoluted nomenclatural tangle involving Oenomaea Hoffman 1964 and O. pulchella (Bollman 1889a) is detailed. Whether in Oenomaea or a new genus, separate generic status seems appropriate for Nannariini with subterminal solenomeres; N. morrisoni Hoffman 1948 and its potential synonym N. shenandoa Hoffman 1949 may also belong here. Initial tribal localities are reported from Alabama, South Carolina, and coastal Virginia and Maryland, and “O. pulchella” occurs in northern Alabama north/west of the Tennessee River; M. castanea is newly recorded from Missouri and Tennessee. A horizontally subtriangular distribution in the eastern and midwestern states is projected for Nannariini, which even occur on South Bass Island, Ohio, in Lake Erie, and may thus inhabit
nearby Pelee Island, Ontario, Canada.
Ptyoiulus Cook 1895, the dominant parajulid diplopod genus in the eastern United States (US), comprises two species – P. impressus (Say 1821), with a slanted, fl ared, circumferentially entire, and marginally serrate apical calyx on the anterior gonopod coxal process, and P. montanus (Cope 1869), n. comb., with a smooth, upright, cupulate calyx that is open caudad and coaxial with the process’ stem. The genus occupies a broad area between the Mississippi River and Atlantic Ocean extending from southern New England, Ontario, and Michigan to the Florida Panhandle and four small disjunct ones – from Montreal, Québec, to northern Vermont, along southwestern Lake Michigan in Wisconsin and Illinois; northeastern/eastcentral Arkansas, primarily in Crowley’s Ridge physiographic feature and beside the “bootheel” of Missouri; and a point locality in northeastern Louisiana just south of the Arkansas line. A male from Chester County (Co.), Pennsylvania, is designated as the neotype of Julus impressus, as is one from Durham Co., North Carolina, for J. montanus. As both species inhabit Montgomery Co., Virginia, the type locality of J. montanus, we exercise the right of first reviser, conserve the latter name, and assign it to the species with the smooth, cupulate, and coaxial calyx. We also exercise first reviser rights and assign Parajulus ectenes Bollman 1887 to this form, thereby relegating it to synonymy under Ptyoiulus montanus. Other new synonymies include Ptyoiulus georgiensis Chamberlin 1943 under P. impressus and P. coveanus Chamberlin 1943 under P. montanus. Both Ptyoiulus and P. impressus are projected for Delaware and Rhode Island and newly reported from Québec, Connecticut, District of Columbia, Maryland, Mississippi, South Carolina, Vermont, West Virginia, and Wisconsin, and the genus and species, respectively, are newly documented from Louisiana and Arkansas; P. montanus is newly cited from Alabama, Arkansas, Georgia, Mississippi, and South Carolina. Ptyoiulus impressus occupies every state except perhaps Louisiana and is the only species in areas that were inundated during the Cretaceous and glaciated during the Pleistocene; by contrast, P. montanus inhabits a relatively narrow east/west transect through the center of the generic range. Their distribution patterns suggest an old species, montanus, being actively displaced by the younger and more successful impressus. The decurvature of the epiproct in uroblaniulinines appears to increase with age and developmental stage. A key is presented to parajulid familygroup taxa in the US and Canada east of the Rocky Mountains.