What's That Bug? does not endorse extermination

Subject:  Bug I.D. please
Geographic location of the bug:  Curtis, Washington
Date: 12/03/2017
Time: 10:41 PM EDT
This beetle/bug landed on our porch tonight just at dusk.  I took a couple of photos and it flew off, straight up for at least 50 feet.  It is about 1.5 inches long.  Does anyone know what type of beetle it is? I live in Western Washington State and this photo was taken today, Dec.3rd
How you want your letter signed:  Sparty

Boreal Diving Beetle

Dear Sparty,
After you went through the trouble to create a composite view of this Predaceous Diving Beetle, we cropped it back into two distinct images.  We believe your individual, because of your location and the grooved elytra or wing covers, that this is a Boreal Diving Beetle,
Dytiscus alaskanus.  According to BugGuide, its range is:  “Transcontinental in Canada and Alaska, also present in parts of n. US as far south as Colorado” and “Overwinter as adults in permanent waters.”

Boreal Diving Beetle

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What's That Bug? does not endorse extermination
Location: Curtis, Washington
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