N. macrocephala is also a nemesiid that's found in Malta, according to Platnick. Remember that N. arboricola is supposedly arboreal, but I guess it's possible they also make burrows in the ground. And there's always the chance that it's a species previously not known from there or that it's undescribed. A definite ID is not possible from those pictures IMO.I'm guessing it was found in Malta. It's a mature male Nemesia sp. (Nemesiidae), and the only mygalomorph in Malta is Nemesia arboricola (an endemic species of yours).
In this case, the description seems convincing enough and suggests that more than one specimen was observed:I got to say the name (N. arboricola) got me thinking, but you can never really be too sure about the ecological validity of latin names.
It's not outside the realm of possibility, mature males and females of the same species can look quite different.I really cannot think these are the male and female of the same species...
N. arboricola Pocock, 1903 --> http://biodiversitylibrary.org/page/19367772Got access to the description of the latter species?