I do not think that they belong to I. micropyga because the hind femora (male) are clearly swollen and the fore coxa is not completely dark and the specimen is not so blackish shining and has stouter appearance than I. micropyga. For me it looks like the oedypodous form of I. pusilla (Fall?n, 1820) which is usually larger and darker (legs in particular) than the typical form. However, I cannot exclude that the specimen may belong to habitually almost identical I. vaporariorum (Haliday, 1836) which also has both oedypodous and slender-legged forms and can be distinguished from I. pusilla only by means of characters in the male genitalia. I. vaporariorum is much rarer than I. pusilla which is common in various rotting substrates.