I had to reply to this message because I find this method of survival (on the ticks' behalf) ingenious, and although I surely hate the little b@stards, I have to respect the power of nature.
Obviously, your female (or perhaps the cage, if it is wood) is harboring ticks. Perhaps your preventative measures are sufficient to keep the population very low. The really fascinating thing about he ticks on the eggs is that if you look close, they are in pairs-mating pairs-who are just waiting for the eggs to hatch to infest the next generation.
>>This is just something I've come across in the past. With 3 out of the 6 clutches I've had with my female there have been ticks climbing around on the eggs, In the whole time I've had her I've never seen a tick on her body. Where do these lil buggers come from?