I have done this in many versions of your mod. I love that I could breed the leporine bee. When I put a forest princes and a medows drone I get two choices but both are common. It used to be common and leporine. I tried switching to medows princess and forest drone but same problem. I even tested to see if it was a visual bug and tried both "common" bee options and it produced common bees both times. Let me know if you need anymore information. Using gendustry-fu-1.5.0.39-mc1.7.10 and forestry_1.7.10-3.7.0.612-unstable.

Awesome thanks I have a few custom settings already and I can add that no problem. You rock man!

Intended, forestry "holiday" (tipsy, tricky, leporine, etc.) bees are now limited to the dates when they are normally available. See #100.

If you want the old behavior, you can make a custom config to enable them. Make a file /config/Gendustry/.cfg:

cfg Genetics {
    cfg MutatronOverrides {
        "forestry.speciesLeporine" = ENABLED
        "forestry.speciesMerry" = ENABLED
        "forestry.speciesTipsy" = ENABLED
        "forestry.speciesTricky" = ENABLED
    }
}