Another spider stinging wasp. What kind is this?

[Galapoheros]

O.K. Here is another one. I saw this one crossing the road about a month ago. I have these in my house too. I've seen them dragging spiders across the ground and up the wall of my house. Big spiders compared to their size. Unlike that other Pepsid wasp, these will aggressively attack you if you try to take their spider. You don't have to get real close either. They will look up at you, take a few steps towards you and flap their wings when you get too close. I had always wondered what it would feel like if I got stung. Doohh! It hurts. I stepped on one in my bathtub. MAN! that hurt. Anyone know what these are called?

 

[orcrist]

No idea on ID, but there are a LOT of wasps that kill spiders, apparently. I've seen an ordinary blue mud dauber land on an aglaenopsis (Same spider as yours has) web, pretend to be prey, sting the spider and fly off with it. Wierd.

 

[NRF]

It´s a Spider wasp (Pompilidae). They mostly hunt wolf spiders (like on your photo), and to my knowledge not web building spiders as mud daubers and other wasps belonging to Sphecidae do.