Ann, the Zebra Longwing populations can really vary from year to year. I once went an entire year without seeing one after a pretty severe (for us) winter. They should make their way back north eventually, but it may take time. I'll try to aim them in that general direction, but no promises!
Keep in mind, I found 23 Black ST eggs, in addition to the ones I already had. I counted it up and I think I have a total of 29 or 30 when you count the already hatched caterpillars. So, lots.
