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This is a spider wasp (Pompilidae) with a spider. She seems to have chewed off most of the spider's legs (not unusual), and will now drag it off to a burrow somewhere to lay her egg on. The egg will hatch and the larva will consume the spider.
There are a couple of references to Brachymeria sp. (in one case B. villosa) parasitising Trypoxylon sp. - and in Brazil!
In case the links don't come through - just google "Peruquetti Brachymeria Trypoxylon"
Hope you are well - sorry I haven't been very active for a while.