Hi Robert,
The status of the Tropicolotes in North Africa I think that is not 100% clear.
Baha el Din (2006) made a separation between T. algericus from T. tripolitanus occidentalis. One of the best things to difference them is the tail, but the tail of your individual is regenerated.
We have here a table about differences (only in spanish
):
http://www.moroccoherps.com/ficha/Tropi ... algericus/Your individual has small Brown marks in the dorsum and a black band through the eyes, so in my opinión is T. tripolitanus.
By the way, do you consider that Tunisia is a safe place now for a fieldtrip? Did you visit south of Tunisia (close to Lybia and Algeria) or only Dghoumes?