I can't say I have ever not had silkmoths mate. Generally they are already going at it before I can remove them from the cocoon container and place them in the egg laying/ breeding container. However I have had a few females mate and never lay eggs or only lay one or two eggs, I noticed that they had not metamorphosed correctly and their egg laying parts were crusted over and it made it impossible for them to get eggs out without a ton of difficulty. I concluded that it was from keeping the cocoons at a high temperature and forcing metamorphosis to quickly. I was keeping the cocoons at 88 to speed up development and they were hatching out in about a week or a little over but they were coming out deformed. I lowered the temp to 80 and have not had the problem in the last 4 months since its been down their. What have you given the females to lay their eggs on? I use paper towels as the females love to stick their eggs to them or just a little piece of cloth. My female did not like laying n plain petri dish.