Sexing Age

At what age can you accurately sex roaches? I have several species that are only nymphs now and I'm curious if they can be sexed when they're ~half grown.

 
Pretty much any that I have listed, also G. oblongata. I'm not too worried about the Gyna since they are so small, but I'm curious about the rest.

 
On the last segment on ALL MALE roaches will be much smaller than the females which will be much larger than the males. Take a look at your adult hisser males and females and test it out!

 
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