This Iberian species was not previosuly reported from Portugal although there is present related species M. occidentalis with slightly different ecological distribution. M. bolivari habitat is restricted to moutains, while M. occidentalis has much wider altitude range.
On iNat there is observation from North West corner of the country (Serra da Nogueira mountain range in Bragança district near Santuário de Nossa Senhora da Serra):
https://www.inaturalist.org/observations/204459745
M. bolivari was reported in the literature previously from mountains in Lugo province, Galicia, Spain just North to this location:
Prieto Piloña, Fernando & Valcárcel, Javier. (2020). Notas sobre dermápteros. I. Presencia de Mesochelidura bolivari (Dubrony, 1878) (Dermaptera: Forficulidae) en Galicia (N.O. de la Península Ibérica).. Arquivos Entomolóxicos. 22. 417-420.