Part 2 of this study deals with the western palaearctic species of the crocata group: N. crocata (Linnaeus, 1758), N. scalaris (Meigen, 1818), N. rossica (Riedel, 1910), N. pratensis (Linnaeus, 1758), N. croceiventris (Strobl, 1909), and N. nox (Riedel, 1910). Subspecific ranking is undertaken in N. crocata (subsp. luteata Meigen, 1818, status nov.), N. scalaris (subsp. terminalis Wiedemann, 1830, as senior synonym of parvinotata Brunetti, 1918, and bispinosa Alexander, 1925), N. pratensis (eepi subsp. nov.), and N. croceiventris (subsp. lindneri Mannheims, 1951, status nov.).