A review of the Nearctic genus Prostoia (Ricker) (Plecoptera, Nemouridae), with the description of a new species and a surprising range extension for P. hallasi Kondratieff & Kirchner Author Grubbs, Scott A. Author Baumann, Richard W. Author DeWalt, R. Edward Author Tweddale, Tari text ZooKeys 2014 401 11 30 http://dx.doi.org/10.3897/zookeys.401.7299 journal article http://dx.doi.org/10.3897/zookeys.401.7299 1313-2970-401-11 F0B2D86F95D14BE88BED667EF5A1DA53 F0B2D86F95D14BE88BED667EF5A1DA53 Prostoia similis (Hagen) Figs 33-40, 42 Taeniopteryx similis Hagen, 1861: 34. Holotype ♂ (USNM), Washington D.C., USA. Nemoura similis : Banks 1907 : 14. Nemoura divergens : Claassen 1923 : 282. Syn. Illies, 1966: 221. Nemoura divergens : Needham and Claassen 1925 : 203. Nemoura similis : Needham and Claassen 1925 : 214. Nemoura (Prostoia) similis : Ricker 1952 : 49. Prostoia similis : Illies 1966 : 221. Prostoia similis : Zwick 1973 : 346. Prostoia similis : Baumann 1975 : 27. Prostoia similis : Poulton and Stewart 1991 : 30. Material examined (Suppl. material 1). Distribution. Canada: ON (New provincial record), PQ ( DeWalt et al. 2013 ); USA: CT, DE, IL, IN, KY, MA, MD, ME, MI, MN, MO, NY, OH, PA, SC, VA, WI, WV ( DeWalt et al. 2013 ), TN (New state record). Remarks. Prostoia similis is readily distinguished from all other Prostoia species by the dorsal sclerite of the epiproct bearing long and sinuate lateral arms. As stated earlier, the ranges of Prostoia completa and Prostoia similis overlap extensively. Examination of large collections of Prostoia similis and Prostoia completa from the Great Lakes region has revealed that the former species appears to be markedly less common with increasing latitude ( Grubbs et al. 2012 ). In comparison to Prostoia completa , there are far fewer historical (pre-1960) and contemporaneous collections of Prostoia similis from Michigan, Minnesota, Wisconson, and Ontario. Figures 33-40. Prostoia similis , scanning electron micrographs, 33 USA, Virginia, Big Run, male, epiproct, dorsal view 34 USA, Virginia, McClure River, male, epiproct, lateral view 35 USA, Virginia, McClure River, male, epiproct tip, dorsal view 36 USA, Virginia, McClure River, male, epiproct tip, lateral view 37 USA, Virginia, McClure River, male, epiproct base, caudal view 38 USA, Virginia, Big Run, male, epiproct base, dorsal view 39 USA, McClure River, Virginia, female, abdominal terminalia, ventral view 40 USA, Virginia, McClure River, female, abdominal terminalia, ventral view. Figure 41. Distribution map for Prostoia besametsa (circles) and Prostoia completa (squares). The open symbols enclosing the solid symbols refer to the type localities for the two species. Figure 42. Distribution map for Prostoia hallasi (circles), Prostoia ozarkensis sp. n. (squares), and Prostoia similis (triangles). The open symbols enclosing the solid symbols refer to the type localities for the three species.