After mating the female lays 10 to 400 eggs, depending on the species. Eggs are typically deposited in a frothy mass that is produced by glands in the abdomen. This froth then hardens to form a papery like case to protect praying mantis eggs inside. The praying mantis egg case is know by a number of names including ootheca, egg pods or egg sack or egg sac. Different species of praying mantis have different types of egg cases. Below are some pictures of different types of praying mantis cases.
Praying Mantis Egg Case Pictures