Seriously, that's Pan's Labyrinth stuff right there.
Of course, there is a reason this kind of bug is called a spider wasp -- its sole mission in life is to transform the world into a never-ending horror movie for its arachnid prey. In this case, the movie is Aliens. The tarantula gets to play the victim; the wasp is the face-hugger. The tarantula hawk will capture, sting and paralyze the tarantula. Then, much as the Alien would, it plants an egg inside the spider's ... ahem, abdomen. Like this:
And, to finish the circle of movie-referencing terror, after growing big and strong on a steady diet of the freaked-out spider's internal organs, the baby tarantula hawk outgrows its home. Yes, this happens exactly as you would expect.