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The last sentence in my previous message needs some correction
in short for the male NW- and Central-European Corixidae species:
1. strigil absent - genus Cymatia, Callicorixa, Paracorixa
- strigil present....2
2. strigil on the left...Corixa (large strigil)
- strigil on the right....3
3. strigil fairly large to large, its length at least halft the abdominal segment size.....Sigara striata, Hesperocorixa, Arctocorisa
- strigil medium-sized to small, its length at most half the the abdominal segment size....other Sigara species and Glaenocorisa

Offcourse there are more diagnostic features