Key to identification of males of European Dicranomyia (Melanolimonia)

Except for the papers cited in the key additional figures of the male terminalia are available in Oosterbroek (2022)

1 Thorax shiny greyish brown............................................................................. 2

– Thorax shiny black.................................................................................... 3

2 Male terminalia: posterior margin of tergite 9 with short thumblike lobe on each side; rostrum of ventral gonostylus subacute at tip. Portugal (Azores); for male terminalia see Nielsen 1963, Figs 1a–b................. D. (M.) azorica (Nielsen, 1963)

– Male terminalia: posterior margin of tergite 9 with broad, low lobes separated by shallow emargination; rostrum of ventral gonostylus narrowly rounded at tip. Albania, France, Portugal (incl. Azores), Spain (incl. Canary Is); Morocco; Turkey; for male terminalia see Kolcsár et al. 2021, Figs 4A–C................................... D. (M.) hamata Becker, 1908

3 Abdomen black throughout.............................................................................. 4

– Abdomen differently coloured........................................................................... 6

4 Male terminalia: posterior margin of tergite 9 with processes short, rather stout, more or less directed inwardly, subequal in length to distance between them. Europe; Russia from European territory to Far East; Georgia, Armenia; Mongolia; for male terminalia see Edwards 1926, Fig. 1c........................................... D. (M.) caledonica Edwards, 1926

– Male terminalia: posterior margin of tergite 9 with processes slender, fingerlike, straight............................. 5

5 Male terminalia: posterior margin of tergite 9 with processes long, about three times longer than distance between them. Europe, except for south (high altitudes); Russia: north European territory; for male terminalia see Fig. 2......................................................................................... D . (M.) stylifera Lackschewitz, 1928

– Male terminalia: posterior margin of tergite 9 with processes short, subequal in length to distance between them. Italy; for male terminalia see Fig. 1.................................................................... D. (M.) annae sp. n.

6 Abdomen black, with posterior margins of segments yellow.................................................... 7

– Abdomen predominantly pale yellowish brown. Europe, except for south; Russia from European territory to Far East; Kazakhstan; Mongolia; for male terminalia see Edwards 1938, Fig. 6c........................ D. (M.) rufiventris (Strobl, 1900)

7 Male terminalia: posterior margin of tergite 9 with processes broad at base, rather stumpy, more or less directed inwardly, their length about twice distance between them; dorsal gonostylus normal in shape, spinelike. Europe; European Russia; Morocco; Transcaucasia, Turkey, Iran; Kazakhstan; Mongolia; for male terminalia see Edwards 1926, Fig. 1a................................................................................................ D. (M.) morio (Fabricius, 1787)

– Male terminalia: posterior margin of tergite 9 with processes more slender, their length more than twice distance between them; dorsal gonostylus broad, more or less bifid at tip. Europe, except for south; Russia: northwest European territory; Kazakhstan; Mongolia; for male terminalia see Edwards 1926, Fig.1b.............................. D. (M.) occidua Edwards, 1928