It is No Drop (except on FV).
I found them mostly near the Felwithe entrance. Just up the hill opposite and around the skellies ring near Kelethin.
One surefire way I found is that if you look around and make sure there are no other wasps for several million miles, then attack a Wasp Drone - a Worker will instantly appear out of nowhere and climb all over you.
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Wherever I go - there I am.