Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 65. (Budapest 1973)
Zwick, P.: Plecoptera from Korea
of preceding sternite. Vaginal lobes not visible. Segments 9, 10, paraprocts and cerci simple. Differential diagnosis — No Ç of Amphinemura with a similarnipple has been described. This structure resembles some species of Malenka (North America), similar to Amphinemura in shape and position of gills ; however, the subgenital plates of these species are of different shape, and there is little reason to suspect that the 9 from Korea might be a Malenka. Ostrocerca dimicki (FRISON), also from North America, has a similar process on sternite 7, but it differs much in the rest of the genitaha and also the gills. Nemoura sahlbergi problematiea ssp. n. (Figs. 17-19) çf Holotype: Korea, Prov. Kanwon, Diamond Range, Man-mul san, 30. V. 1970 (No. 68). The single available çf resembles A 7 , sahlbergi in colouration, size (expanse 15 mm) and the very characteristic epiproct, while the cerci and paraprocts differ considerably. Cercus relatively longer and more slender (compare to figures of A r . sahlbergi sahlbergi, Figs. 20-22), with distal portion strongly bent, particularly in lateral view. Outer terminal spine heavy, bifid, inner one short and minute, directed slightly posteriorly. Big accessory spine of nominate form (pointing dorsally and anteriorly) absent. Membranous distal portion of cercus shifted more to inner and ventral faces of cercus than in N. sahlbergi sahlbergi; tip of membranous portion sclerotized to form a small tooth. Paraproct with a pointed, triangular tip, not truncate as in nominal subspecies. Discussion — The taxonomic rank of the new form of Nemoura is problematic. The differences between it and A. sahlbergi regarding cerci and paraprocts are important, while the epiprocts are identical. However, the epiproct is of special importance to distinguish species in this genus ; I know of no species of Nemoura that could not be separated from its closest relative by a study of the epiproct. I also know that the species closely related to N. sahlbergi (N. trispinosa CLAASSEN, N. arctica ESBEN — PETERSEN are also subject to considerable geographic variation in the cerci and paraprocts, the epiproct remaining usually unmodified. N. sahlbergi had been known from the arctic zone of the Palearctic Region, but has recently been found far south in Mongolia (RAUSER 1968) and near Irkutsk (ZAPEKINA — DULKEIT 1971). I have seen a çf from Transbaikalia. (CoU. LEVANIDOVA), which also differed from the typical form in the cerci and paraprocts, though to a much lesser degree than N. sahlbergi problematiea. I therefore presume that the Korean subspecies is merely a geographical race of N. sahlbergi, connected to the nominate form by intermediate and probably interbreeding populations and attribute subspecific rank to this form only, until further evidence is available. Nemoura tau ZWICK 1973, Nemoura tau ZWICK, Fragm. Faun., 19: 150, figs. 1—5. 9 çf çf 5 9 9 : Korea, Prov. Kanwon, Diamond Range, Hotel Go-song. 30. V. 1970 (No. 70): 3 çfçf: Diamong Range, Guriong chon, 1. VI. 1970 (No. 83).
