skink1978,
sometimes it is really hard to differentiate between siculus and melisellensis.
Here are some features which may help.
The dorsal stripe:
In siculus it is allways with straight borders, while in melisellensis it is a little bit zig-zag. In this photo, shown here, the dorsal stripe in parts very light colored, but you may see the straight borders. Also, in siculus it mostly ends in the front at the rear of the head, while in melisellensis often in midbody.
The flanks:
If you see the lizard from the side, in siculus there are never two ventrals with blue spots side by side, while in melissellensis often 3 or 4 blue spotted ventrals are side by side.
Also melisellensis has a bit smaller and smoother dorsal scales, which give a "oily" appereance of the lizard.
Mario