Why my coriander won't germinate....

My wife loves cilantro (coriander, Chinese parsley).  I gathered as many seeds as I could last year, but absolutely none would germinate.  I decided to cut one apart to see if it looked ok internally, but when I put the seed (approximately 1/8" in diameter) under the microscope I found out why they don't grow.  A large percentage (well over 60%) had holes 0.025" in diameter "drilled" into the shell.  I don't know what the bug looked like, but it was certainly small!