Well, 40 is a common number for them. If you're too lazy to calculate how many of each there will be, just do it the easy way. Create 100-200 Jebus creatures in the map editor and see how many of each appear. You can even get an approximate range if you have the patience.
I've already counted... and it turns out to be 40. I had a double Gold Order, the first wave had 26 Hydras, I killed them without even noticing, and then I thought there were no more than 30 Behemoths. But there were... a whole bunch of them. Oh well, I'll hope my opponent has it even worse :)
