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Is something on the wrong coast?

I found a big (three-plus inches) beetle in the yard this morning and through this site was able to identify it as a female prionus californicus, California root borer. My camera isn't cooperating so I can't include an image, but others' photos make the ID pretty certain. Comments mention that it's a western critter, but I'm on Boston's north shore, Massachusetts. Is this a tourist or is the prionus' habitat this wide? I've never seen anything quite like it before (and, as I took it out to release it in the woods, probably won't again).

There is a big Prionus out east also
are you certain you didn't see laticollis? in the guide here. -- or pocularis here

 
Aha!
I think you're correct about it's being laticollis instead. The cousins certainly do look alike, and I'm a neophyte at identification. Thanks.

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