Hard to tell...

Poulakakis et al. (2003) referred to subspecies, but did not include mainland erhardii samples.
Lymberakis et al. (2008) do not map their continental erhardii samples' origin. The most basal clade of "continental" erhardii in their analysis is one from Skopelos, Alonisos and Gioura. The remainder of the "continental" samples seems to be divided into 2 groups. The "smaller one" is referred to samples of Ag. Georgios, Stouronisia, Limni, Perati, Kokkinonisi and Prasonisi. As far as I was able to locate these place, they seem to be smaller islands close to Alonisos and in Thessalia. Hard to be sure, because the same toponyms tend to be used for many different places in Greece. 

Additional note...

If a subspecies shows marked morphological differentiation, there's not really necessarily the need for molecular substantiation...

Another reason why it's not very useful to accept all historical subspecies of erhardii, in my opinion. 

Peter,

here some informations, given to me by Werner Mayer:

"There is no difference between thessalicus and riveti (no morphological or DNA).
ssp. thessalicus was described by Cyren in 1938 from the NE side of Olympus mountain.
Chabanaud described riveti 1919 from Strkovo, a village east of lake Prespa. Gruber, in the "Handbuch, 1986" gives the terra typica with Strkovo, Macedonia (FYROM).
But there is, and was never, a village called Strkovo in FYROM."

But there is a village Plati east of Mikri Prespa lake, and the former name was Strkovo. All "foreign" spelled village names have been changed to Greek ones in 1919.

riveti is distributed from Albania, FYROM and Bulgaria south to the Mornos valley (between Vardussia and Giona mountain ridges, Nomos Fokida, 30 kms beeline NW of Delfi, Greece.

Mario 

Excellent, thanks, Mario. 

ok, thanks a lot - I have nothing to add! ;-) 

so to make it more clear, thessalicus = riveti? 100% sure? 

Yes, there are only two ssp. of erhardii on "mainland":
Podarcis e. riveti distributed like given above and
Podarcis e. livadiaca south of riveti, including Peloponnes.

Mario 

Thanks Mario
Well according to the greek book of mine, thessalica occurs also at Evia, do you know anything about that? 

Ilias,
the "Handbook" says ssp. livadiaca for Evia.
Sorry, not more information. As far as I know, in Werner Mayer´s DNA samples, not one of Evia was included.
Mario