Alloperla mediata (Navás, 1925)

Chloroperla mediata Navás, 1925: 210; Claassen 1940: 191; Illies 1966: 441.

Alloperla (Sweltsa) mediata (Navás, 1925): Nelson and Hanson 1968: 425.

Alloperla alexanderi Nelson & Hanson, 1968: Zhiltzova and Zwick 1971.

Alloperla mediata (Navás, 1925) in Zwick 1973: 285; Ham 2008: 185; Teslenko 2009: 699; Judson and Nelson 2012: 25; Huo et al. 2022: 9.

Material examined. • 2 females, China: Inner Mongolia Autonomous Region, HulunBuir city, Oroqen Zizhiqi, Dayangshu town, 405 m, 49.7086°N, 124.5899°E, 2023.VI.3, leg. Zhu Ya-Fei & Yang Xiao (ICYZU) • 1 male, 5 females, Heilongjiang Province, Da Hinggan Ling Prefecture, Songlin District, Jinsong town, 480 m, 51.0724°N, 124.1948°E, 2023.VI.4, leg. Zhu Ya-Fei & Yang Xiao ; • 3 males, 20 females • Heilongjiang Province, Da Hinggan Ling Prefecture, Xinlin District, Dawusu town, 471 m, 51.7682°N, 124.5122°E, 2023.VI.6, leg. Zhu Ya-Fei & Yang Xiao (ICYZU) ; • 4 males, 2 females China: Heilongjiang Province, Da Hinggan Ling Prefecture, Tahe county, 364 m, 52.3050°N, 124.6968°E, 2023.VI.6, leg. Zhu Ya-Fei & Yang Xiao (ICYZU) .

Supplementary description. General body color pale yellow in alcohol. Head pale brown, triocellate. Pronotum with prominent, dark-brown medial stripe (Fig. 4 A). Epiproct short, pointed, divided into two portions, nearly equal in width, separated by noticeable constriction. Anterior portion of epiproct oval, bearing several spines along lateral margins, easily visible from dorsal view (Fig. 4 B, C). Female subgenital plate long, narrowly triangular with rectangular, parallel-sided base, extending nearly full length of sternum 9 (Fig. 4 D).

Distribution. China (Heilongjiang, Inner Mongolia, and Liaoning), Japan, Mongolia, Russia, and South Korea.

Remarks. This species was first described from China by Nelson and Hanson (1968) as Alloperla alexanderi Nelson & Hanson, 1968, but it was later synonymized with A. mediata by Zhiltzova and Zwick (1971). The type locality is the Russian Far East, which includes Khabarovsk and Vladivostok. It has been recorded in China from Heilongjiang, Inner Mongolia, and the Greater Khingan Mountains.