A species of flying beetle.

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1849.  The dor-bugs hummed through the tent.—Parkman, ‘The Oregon Trail,’ p. 42. (N.E.D.)

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1872.  All plain enough, I do not doubt, to those accustomed to handling dor-bugs and squash-bugs and such undesirable objects of affection to all but naturalists.—Holmes, ‘The Poet at the Breakfast-Table,’ chap. ix.

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