The first reports came from around Topaz Lake. Now, they've been spotted from Yerington to Dayton, in Gardnerville, Carson City, Elko and parts of Reno.
State entomologist Jeff Knight says he's getting several calls an hour.
He says the beetles may be crawling around in such numbers because of the bugs that have come before them.
This spring and summer have seen large numbers of other insects including painted lady butterflies, cutworm moths and white-lined sphinx moths. All of those flying insects have an earlier life stage as a caterpillar, which are a favorite food of the beetles when they are in larval stage as well as later in life.
Knight says plentiful food weeks ago could have produced plentiful beetles today.