They would be fairly hard to track. Due to them flying, they could go anywhere without the humans being able to follow their tracks. The best way would be word of mouth, they would set out on a hunt when they heard word of an active pack.
My preferred tactic would be a large blanketing group. The best way to fight a group, is with a bigger group. However, not just any group, due to their intelligence a group of angry farmers with pitchforks isn't likely to do well. Perhaps there will be witcher-like groups providing a "pest control" service. They would be highly trained and demand a fair price.
They could wield spears for ground assault, shields where necessary. Bows or crossbows with roped arrows would be your most valuable weapon. Hit them with one roped and barbed arrow, and you can pull them down and fight them on the ground. From then it's nets and spears.
Perhaps you could employ catapults or ballistae with netting ammo. But depending on their manoeuvrability this might not be very effective.