How to tell adult hissers from nymphs

Arashimaru

Ootheca
Hello,

I have a small colony of Gromphadorhina oblongonota, and since I have a similar amount of males and females, I thought I should cull some of the males so their fighting doesn't stress the colony too much. I would like to feed off the smaller adult males to select for larger individuals, but how can I tell the difference between a small adult and a large nymph?

 
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