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Dear Adrian,

Because this peculiar species has attracted so much attention I would like to give some broader comments.
1. Your fine species from Italy can be readily distinguished from this species by wings and halteres completely absent (as you have noted), pale yellow palpi, colour of legs and some other characters.
2. I placed this species within Tachydromia but, following current systematic of Tachydromiinae, the species should be placed within Pieltainia Arias, 1919. Arias erected this monotypic genus owing to lack of wings and halteres in his species. So, I believe that Pieltainia is likely a synonym of Tachydromia. Hopefully, at the nearest time, we will discuss this situation as Paul have noted.
3. This species vs. Pieltainia iberica Arias, 1919. According to these pics this species is very similar to Pieltainia iberica Arias, 1919 [described from Cala, provincia de Huelva (Spain)]. However, Portuguese species has vestigial wings (in male only?) and slight differences in legs colour. It is interesting to note that P. iberica was found in early spring actively running about in pursuit of Sciaras and other microscopic Diptera on which it preyed.

All the best,:)

Igor