S. Mahunka szerk.: Folia Entomologica Hungarica 61. (Budapest, 2000)

36 (35) Mesonotum entirely black 37 (46) Wings infuscate. Head, mainly the thorax, first and apical segments of abdomen black 38 (39) Hind femur and tibia are partly red. Head dilated behind the eyes. Penis valve similar to that of D. germanicus (Fabricius) (Fig. 189) melanopterus Konow 39 (38) Hind legs always black 40 (41) Smaller species, 7.0-8.0 mm. 3rd-4th tergites red. Wings infuscate. Penis valve in Fig. 198 japonicus (Kirby) 41 (40) Larger species, 7.0-11.0 mm. 2nd-6th or 2nd-5th tergites red 42 (43) Length 9.0-11.0 mm. Hind legs black. Head contracted behind the eyes. Penis valve in Fig. 191 rugosus Freymuth 43 (42) Length 7.0-9.0 mm 44 (45) Penis valve in Fig. 189 germanicus (Fabricius) 45 (44) Penis valve in Fig. 190 pakistanicus Muche 46 (37) Wings hyaline. Head, thorax, first and apical abdominal segments black 47 (48) Head in dorsal view behind the eyes sligthly converge. Penis valve in Fig. 193 grombczewskii Jakovlev 48 (47) Head in dorsal view behind the eyes strongly converging. Penis valve similar to that of D. gessneri Ed. André, however, its dorsal margin convex (not straight) and ventral margin straight (not concave). 9.0-11.0 mm subfasciatus Smith 49 (30) Middle and hind tibiae entirely or at least mostly red 50 (53) Antenna short, much shorter than abdomen. Wings hyaline. Apical third of hind tibia mostly black 51 (52) Penis valve with a hook. Fig. 194. 7.0 mm kamimurai Togashi 52 (51) Penis valve rounded. Fig. 195. 6.0-7.0 mm aericeps C. G. Thomson. 53 (50) Antenna longer, nearly as long as abdomen 54 (55) Hind tibia red. Penis valve similar to that of D. germanicus (Fabricius) (Fig. 189) 7.5-9.0 mm etruscus (Klug) 55 (54) Hind tibia piceous or brown along the whole length of its inner or lower side. Penis valve in Fig. 196. 7.0-8.0 mm cothurnatus Lepeletier 56(15) Legs entirely black 57 (64) Abdomen entirely black (four species) 58 (59) Robust species, 10.0-12.0 mm. The whole body black. Sometimes the mesonotum marked with red. Penis valve in Fig. 199 cameroni Kirby 59 (58) Smaller species. Penis valve different. (D. laevigatus Hellén may run here, so check also couplet 21 (22)) 60 (61) Antenna distinctly longer than the abdomen and very slender, with segment 8 more than 4 times longer than the basal breadth. Head in dorsal view clearly but moderately strongly narrowed. Thorax without red spots. Occipital furrows reduced, very short. The red girdle on the abdomen of this species is often reduced or obsolete. (Entirely black forms sometimes occur, the former var. unicinctus Enslin.) Penis valve in Fig. 201. 9.0-10.0 mm madidus (Klug) 61 (60) Antenna at most about as long as the abdomen; segment 8 at most little more than 3 times longer than broad