New Zealand Weta, cross New Zealand off the list...
Cook Strait giant weta head shot
Katipo Spider of New Zealand. Their venom is many times more potent than that of a Rattlesnake. It is apparently true that they do like hiding under toilet seats.
25 Most Amazing and Unusual Animals on Earth
Giant Weta (Native to New Zealand) genus Deinacrida, family Anostostomatidae, can grow over 4" long. It is documented that one captive female grew to a mass of 2.5 oz, making it one of the heaviest insects in the world. It's genus name is Greek for Terrible Grasshopper.
Some of the Worlds Biggest Bugs Giant Weta: New Zealand. (Thankfully not on the mainland.) Oh..and this insane guy.