Key to species of the genus Rhinotorus Förster, 1869

1. Metasoma entirely black, without any reddish colouration (Figs 4E, 5E, I, 6D, 11A, C, D, 14, 15C), sometimes male tergites reddish or brownish centrally or on hind margins ...............................….. 2

– Metasoma partly distinctly reddish (Figs 3E, 7E, 8B, E, 9 B–C, 10E, 12C, 13C) ............................. 6

2. Scutellum yellow (Fig. 11C). Face black a yellow spot above each clypeal fovea (Fig. 11B) ............ ......................................................................................................................... R. ovalis (Davis, 1897)

– Scutellum black (Fig. 15D). Female face black without yellow spots (Figs 5A, 6A, 15A) .............. 3

3. Female with each coxa darkly coloured. Male with only hind coxa black (the rest yellow) (Figs 4E, 5I, 6D). Hind tibia black apically and reddish-yellow basally (Figs 4E, 5I, 6D). Metasomal tergites 1–3 strongly punctate and with strong transverse impressions (Figs 5E, 6C) ................................... 4

– Each coxa yellowish-red (Fig. 14). Hind tibia black basally and apically and yellow centrally (Fig. 14). First and second metasomal tergites with weak transverse impressions, third metasomal tergite without impression, granulated and impunctate (Fig. 15C) .... R. umbrarum (Holmgren, 1857)

4. Face and mesopleuron shining and rather densely and distinctly punctate (Fig. 5A, H). Face and clypeus strongly projecting apically. Hind tibia entirely black (Fig. 5I) ............................................. .......................................................................................................... R. compactor (Thumberg, 1822)

– Face and mesopleuron matt or weakly shining, shagreened and either impunctate or weakly punctate (Figs 4A, D, 6 A–B). Face and clypeus weakly projecting. Hind tibia reddish basally (Figs 6 D–E) .. ........................................................................................................................................................... 5

5. First metasomal tergite convex in profile. Male with mesoscutum and mesopleuron black (Fig. 6B). Parameres thin ........................................................................................................ R. jussilai sp. nov.

– First metasomal tergite flat in profile (Fig. 4E). Male with lateral lobes of mesoscutum and lower part of mesopleuron yellow (Fig. 4D). Parameres broad (Fig. 4 B–C) .............. R. campester sp. nov.

6. Female face with yellow spots (Fig. 12A). Ramulus on the 1m-cu present (Fig. 12C). Propodeum with area basalis and area superomedia separated by carina (Fig. 12B). Hind wing with cu-a intercepted far below middle, almost at vein 1A (Fig. 12C) ......................................... R. similis (Brischke, 1892)

– Female face entirely black (Figs 3A, 7D, 8C, 9A, 10A, 13A). Ramulus absent (Figs 3E, 8E, 9C). Propodeum with area basalis and area superomedia continuous (Figs 3C, 7C, 9B, 10C). Hind wing with cu-a intercepted at or below middle but always distant from vein 1A ....................................... 7

7. First metasomal tergite not projecting at spiracles and gradually narrowing towards its base (Fig. 10D). Clypeus relatively thin and projecting (Fig. 10A) ......... R. nasutus (Gravenhorst, 1829)

– First metasomal tergite projecting at spiracles or strongly constricted basally (Figs 7A, 9B). Clypeus relatively wide and not projecting (Figs 8C, 9A) .............................................................................. 8

8. Scutellum yellow (Fig. 7B) ........................................................ R. leucostomus (Gravenhorst, 1829) – Scutellum black (Fig. 8A) ................................................................................................................. 9

9. Metasoma (excluding first metasomal tergite) reddish (Fig. 8B). Mesopleuron shining and distinctly punctate ................................................................................. R. longicornis (Schmiedeknecht, 1914)

– Metasoma with central tergites reddish (Figs 3E, 9B, 13C). Mesopleuron coriaceous, matt, and impunctate ....................................................................................................................................... 10

10. Transverse impression of first and second metasomal tergites rather distinct (Fig. 13C). Hind femur 4.2 times as long as broad and with basal tarsomere of hind tarsus more stout (6 times as long as broad) (Fig. 13D) ................................................................................................ R. tarsilatus sp. nov.

– Transverse impression of first and second metasomal tergites weak (Figs 3E, 9B). Hind femur 5 times as long as broad and with basal tarsomere of hind tarsus more slender (9–12.5 times as long as broad) (Figs 3E, 9C) ........................................................................................................................ 11

11. Head roundish in anterior view (Fig. 9A). Transverse impression of first metasomal tergite clearly defined (Fig. 9B) .......................................................................... R. mesocostanus (Thomson, 1894)

– Head diamond shaped in anterior (Fig. 3A). Transverse impression of first metasomal tergite not defined (Fig. 3E) ......................................................................................... R. alpinus (Roman, 1909)