Best spot to camp these is at E-9. There's a little ring-like area with 2 spawns on the outer side, then a spawn to the north. You can stay out of the corses' way but there sometimes could be elementals so be careful of them. We took these down easily with 75 WHM/NIN, RDM/NIN, SAM/THF, SMN/WHM and THF/NIN... had crappy drops until the THF showed up but then they dropped almost like rain ^^; Good luck!
drops off trench antlion also, was tryin to get antlion trap for pumps, soloed these fine as 75 thf but being poisoned kinda sucked so i would bring plenty of antidotes (about 2-3 stacks) killed about 8 of them with th3 and got 2 h.q. jaws. i would sit and F-8 (pops from crack in the ground b4 a dead-end, top left corner of f-8) and continuesly pop the same antlion (takes about 5 mins from tod to repop) because didn't have silent oils to get past scorpions and i was to lazy to fight them to find more spawns for trench antlions. if you have whm npc that works great, poisona and heals ftw gl!