Diamesa steinboecki Goetghebuer

(Figs. 26–29, 34–36, 73, 77)

Diamesa steinboecki Goetghebuer, 1933: 73, 1939: 16; Pagast 1947: 487; Wülker 1959, figs. 2–4; Pankratova 1970: 83; Serra-Tosio 1971: 182, 1974: 168; Schmid 1993: 41; Langton & Visser 2003: 47; Ashe & O’Connor 2009: 285; Rossaro & Lencioni 2015: 65; Montagna et al. 2016: 329.

Material examined. 1 adult male, TAJIKISTAN: Murgab District, Gorno-Badakhshan Autonomous Region, Pamir Mountains, Sasykteke River, (Sauksay River basin), altitude 3815 m above sea level, 25.VIII.1987, N 39.288347, E 72.370182, leg. D. Shcherbakov ; 2 adult males, 2 mature pupae (male and female), SWITZERLAND: Valais Canton, Swiss Alps, Muttbach Stream, 16.IX.2018, altitude 2500 m above sea level, leg. B. Lods-Crozet ; 1 adult male, FRANCE: cold spring, French Alps, Massif of Pelvoux, Lautaret Pass, 9.IX.1966, leg. B. Serra-Tosio ; 1 mature pupa (male), 2 mature pupae (females), 2 larvae, French Alps, Massif of Aiguilles-Rouges, Balm Stream, 8.IX.2021, altitude 1862 m above sea level, N 45.97933, E 6.840494, leg. P. Clévenot.

Remarks. Despite the rather widespread of D. steinboecki in the mountains of Europe, a detailed description of the adult male, the variability of brachypteric and macropteric forms at different altitude above sea level, was made only for the French Alps (Serra-Tosio 1971, 1973, 1974). Therefore, we found it expedient to give a brief re-description of males based on our material from the Pamir Mountains, where the species was found for the first time, and the Swiss Alps, as well as to add some data to the description of Serra-Tosio (1971, 1974) from the French Alps. Data of Serra-Tosio (1974) in our description are highlighted in bold.