On average it should be around 30-40 nymphs, a good size fertile ootheca could yield as many as 70 nymphs or even more. If you are so inclined, please read the following thread and hopefully it will answer more of your Idolomantis questions.
http://mantidforum.net/forums/index.php?showtopic=8118&st=0&p=43646&hl=shipment&fromsearch=1entry43646
That thread brings back lot of memories on my first 'adventure' with this species.
http://mantidforum.net/forums/index.php?showtopic=8118&st=0&p=43646&hl=shipment&fromsearch=1entry43646
That thread brings back lot of memories on my first 'adventure' with this species.