As a Master of Many Forms, I recently started to use the Harpoon Spider as a form.
Full attack is :
Bite +11 melee and 2 fangs +2 ranged
The ex attack harpooning works like this
Harpooning (Ex): A dread harpoon spider can fire its harpoonlike fangs up to 20 feet (no range increment). A successful hit deals 1d6+1 points of damage as the harpoon hooks the flesh of the target and immediately exudes a thick, sticky glue. The spider can reel in a harpoon as a free action; treat this as a trip attack (+19 bonus) against any creature attached to the fang. Failure indicates that the harpoon rips free (and deals another 1d6+1 points of damage to the victim). This ability is otherwise like the ordinary harpoon spider's harpooning ability.
Now, the question is, would it be possible to use the harpoon first, reel the target in and then bite, all in a full attack? Or do I have to wait until the next turn to bite?