Waft Emitter Gold Cards

[PointBreak]

I've been using the waft emitter to farm gold cards, and it's worked on all the bugs except the black widow. I've killed hundreds and hundreds of them, and I haven't been reloading saves and have also tried adding more rage to the waves. It seems to be a weaker version of the black widow that naturally spawns, which may be why it's not giving me the card. Am I just unlucky, or are you not able to get the black widow's gold card from the waft emitter?