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Hi,
Silvestrichilis sp., for sure.
Here is an other picture, from Serbia too :
http://www.naturefg.com/pages/c-animals/machilidae.htm
In bibliography there is no Silvestrichilis know from Yugolavia...

There are now 17 species in this genus.
List of the sp : http://www.sylvestris.org/microcoryphia/taxon.htm#m4s

It look like Silvestrichilis trispina (male), a species know from Israel, Turkey and Cyprus.
May be it is the same, but it would be very unwise to tell this.
The samples, preserved in alcohol at 70, are examined under a microscope for proper identification.