Key to the European species of Pipiza luteitarsis group

1 Hind femora without pair of ventral longitudinal ridges at the distal end (as on Fig. 12); ventral part of basoflagellomere reddish (Figs. 4–9); male genitalia: hypandrium with short lower gonocercus (about 1/3 length of theca; Figs. 19, 21, 23, 25: lgc) ............................................ Pipiza luteitarsis species-group... 2

- Hind femora with pair of ventral longitudinal ridges at the distal end (as on Fig. 13: lr); basoflagellomere dark; male genitalia: hypandrium with long lower gonocercus, in lateral view (about 3/4 length of theca; as on Fig. 27: lgc) ................................................................................other West-Palearctic Pipiza species

2 Holoptic: males...........................................................................................................................................3

- Dichoptic: females.......................................................................................................................................6

3 Abdomen short and broad (tergite 4 more than 2 times as wide as long, Fig. 17: T4), usually with pair of pale spots on tergites 2 and 3 (Fig. 17); marginal ridge of abdomen well defined (Fig. 17); body predominantly black haired; male genitalia on Figs. 25, 26 .................................. Pipiza quadrimaculata (Panzer)

- Abdomen elongated (tergite 4 less than 2 times as wide as long, as on Fig. 15: T4), without, or only with a pair of pale spots on tergite 2; marginal ridge of abdomen less conspicuous (as on Fig. 15); body predominantly pale haired........................................................................................................................................4

4 Face pale haired; basoflagellomere elongated (almost 1.5 times longer than wide, Fig. 4); only metatarsus of hind legs darkened; tergite 2 with long sticking out hairs (Fig. 10); male genitalia: basal part of surstyli

with well-developed semicircular lobe (Figs. 19, 20: sl) ....................................... Pipiza luteibarba n. sp. - Face predominantly black haired; basoflagellomere short, oval (wider than long); tarsi of all legs partly darkened or at least of middle and hind legs; tergite 2 without long sticking out hairs (as on Fig. 11); male genitalia: surstyli with reduced or with small basal semicircular lobe (Figs. 21–24: sl)............................5

5 Male genitalia: surstyli with small basal semicircular lobe surpassing epandrium (Figs. 23, 24: sl); inner part of basal semicircular lobe with dense pale spines (Fig. 24: sl) ..................... Pipiza accola Violovitsh

- Male genitalia: surstyli with reduced basal semicircular lobe not surpassing epandrium and without inner spines (Figs. 21, 22: sl) .................................................................................. Pipiza luteitarsis Zetterstedt

6 Frons without pollinose lateral spots as in Fig. 3; body hairs very short; wing densly microtrichose, without bare areas in cells BR and BM .......................................................... Pipiza quadrimaculata (Panzer)

- Frons with pollinose lateral spots as in Figs. 1 and 2; body hairs longer; wing with bare areas in cells BR and BM........................................................................................................................................................7

7 Tergite 5 longer than wide (Fig. 16: T5)......................................................... Pipiza luteitarsis Zetterstedt

- Tergite 5 wider than long (as in Fig. 14: T5)..............................................................................................8

8 Basoflagellomere short, oval (slightly longer than wide, Fig. 9); frons in the level of anterior end of pollinose lateral spots broader than eye diameter (dorsal view) ................................. Pipiza accola Violovitsh

- Basoflagellomere elongated (1.5 times longer than wide, Fig. 5); frons in the level of anterior end of pollinose lateral spots narrower than eye diameter (dorsal view) ................................. Pipiza luteibarba n. sp.