This being appears to be a male human, shorn completely bald and hairless on his entire body. He wears nothing over his muscular frame except for a pair of breeches.
I don't want them to be as scaly as a medusa, but I can see a slight alteration in their appearance. Maybe something like the faint appearance of scales along their shoulders, elbows, eyebrows, etc, or maybe in some places their skin peels and flakes away like a snake shedding its skin. I think a maedar should be able to disguise itself as a human with relative ease, but making them more reptilian (they already have no body hair) does seem wise.
Feats: Combat Expertise, Power Attack, Track
No one is suggesting removing Combat Expertise (since I raised the Int by +1), and Track is grandfathered in.

Power Attack is up for debate, but I see no immediate reason to remove it. Improved Sunder and Spring Attack were suggested as possible bonus feats. The Diehard feat was also suggested, to build upon the Transfer to Glyptar power and tough them up in general (though the dire boar's Ferocity power might make it a lot easier). We sure as hell aren't going with three bonus feats, though.

Discuss!
How about this:
Adamantine Strike (Ex): A maedar's fists are extremely hard and can punch through most materials. A maedar's slam attacks are treated as adamantine weapons for the purpose of overcoming damage reduction and hardness.
"Most medusas typically mate with human males, as a maedar can be difficult to find. This cross produces two to six eggs that hatch into fledgling females, who mature into medusas. When a medusa is able to find a mate with a maedar, the eggs will hatch into human infants instead (who turn to stone at the sight of their mother), though an infinitesimal percentage of males born from such a pairing will be maedar."
Should we remove this section entirely, or change it a bit? We can switch it up so that medusas who mate with humans have either medusa or human babies (which die immediately), and when medusas and maedar mate they make well... medusas and (rarely) maedars.

personally, I like the weird genetic anomaly as ol' Ed wrote it, but I can see how it would be difficult for some DMs to accept - and I do have to look out for them, don't I?
In the end, though, removing the section might be for the better. Discuss!