Dirrefenti linee di Corna

There are several examples of homozygote hornets shown above. The beak is cavernous and the horns relatively small compared to the larger hetrezygote examples. Breading two homozygote examples together will start the process of standardising for duplex comb. That will leave you to concentrate on colour, type, legs etc.

3rd post third photo from left in the middle,
4th post first from left on second row