Metoisops Popov and Herczek 1992

Key to the species of extinct genus Metoisops (updated from Herczek and Popov 2014)

1. Pronotum very broad, posterior width not less than 2.4× midline length.................................................. 2

– Pronotum not very broad, posterior width less than 2.4× midline length.................................................... 3

2. Pronotum wider than 3× midline length; head width subequal to 3× head length.............................. M. akingbohungbei

– Pronotum subequal to 2.4× midline length; head width subequal to 2.5× head length.................................. M. groehni

3. Head transverse, width more than 2.6× length................. 4

– Head width not more than 2.6× length........................ 7

4. Dorsal width of single compound eye more than 2× vertex width.......................................................... 5

– Dorsal width of single compound eye not more than 2× vertex width................................................. 6

5. Dorsal width of single compound eye subequal 2× vertex width; pronotum posterior width subequal to 2.1× midline length..................................................... M. kerzhneri

– Dorsal width of single compound eye subequal 2.9× vertex width; pronotum posterior width subequal to 1.9 midline length................. M. michalskii Kim, Taszakowski, and Herczek sp. nov.

6. Body large, more than 3 mm; ratio of scutellum and commissure lengths = ca. 1.. M. popovi Kim, Taszakowski, and Jung sp. nov.

– Body less than 3 mm; ratio of scutellum and commissure lengths = ca. 1.2...................................... M. grabenhorsti

7. Head width subequal to 2.2–2.35× midline length............. 8

– Head width subequal to 2.5× midline length.................. 9

8. Ratio of pronotum anterior and posterior widths 1.85–2.0; claval commissure shorter, ratio of claval commissure and mesoscutum + scutellum lengths ca. 1.25–1.27............... M. punctatus

– Ratio of pronotum anterior and posterior widths ca. 1.65; claval commissure shorter, ratio of claval commissure and mesoscutum + scutellum lengths more than 1.5................. M. consimilis

9. Mesoscutum broad, 1.8× length subequal to scutellum length; hemelytra with scattered punctuate corium and clavus and delicate pubescence......................... M. punctatodiffusus

– Mesoscutum distinctly narrow, 4× length subequal to scutellum length............................................. 10

10. Dorsal width of single compound eye less than ca. 1.65× vertex width; scutellum slightly wrinkled; cuneus coloration uniform................................................. M. variabilis

– Dorsal width of single compound eye more than ca. 1.65× vertex width; scutellum shiny and impunctate; cuneus coloration not uniform, its apex dark brown.................... M. intergerivus