Here's the lure.  Inside the hive network should be a crystal of some sort.  We think the silithid use the crystal as some sort of hive-wide attunement device.  As for where this crystal might be, I'd say try the hatcheries inside the hive.$B$BUsing the lure on the crystal should roust out the queen, but be warned - she will probably be protected by several guards.  Take out the queen and remove her brain.  As icky as that sounds, we desperately need to study it.  Good luck, $N!