They're too dry. You can fix the problem easily enough, though.
Mist the substrate you're incubating them in (perlite, vermiculite, etc) with water, but don't get the eggs themselves too awful wet. Then cover the eggs and substrate with a wet paper towel. That will do two things, provide more humidity for the eggs by lessening the evaporation oportunities and tell you when you need to mist them again (the towel will be dry)!
Have fun -- Darin