Geographic location of the bug: Niagara Falls, Ontario
Time: 12:06 PM EDT
What is this wasp dragging a spider across the deck? The iridescent blue wings and striped body, rusty colored legs and eyes are beautiful. It was very fast but I was able to get a very short video of it.
How you want your letter signed: Dawn
This is a Spider Wasp in the family Pompilidae, and female members of the family hunt and paralyze Spider to feed to the developing brood. Your species, Tachypompilus ferrugineus, does not have a species specific common name. According to BugGuide: “Adults are often found taking nectar from flowers (Daucus, Pastinaca, and Eryngium). Females provision nests mainly with Lycosids” meaning the Spider in your image is most likely a Wolf Spider.