This is the head of a skink, Scincopus fasciatus. It is a specimen from the Museum of Comparative Zoology at Harvard University, catalogue number 112193.
Scincopus fasciatus is a desert lizard from north Africa. In the woeful reptilian pet trade it is sometimes known as the Tunisian Night Skink.
What the letters mean:
EL = ear lobule.
G = supraocular groove.
PN = postnasal scale.