These common beetles are named for the months they are most numerous in, May and June. The adults are nocturnal, foliage feeders, while the larvae, known as white grubs, feed on roots of grasses and other herbs underground. They are clumsy walkers and fliers and attracted to lights …and well known for their noisy, awkward arrivals at porch lights and window screens on early summer nights. There are at least 400 species collectively distributed across North America except for Alaska and far northwestern Canada. The members of this genus vary in size, and vary in color from reddish brown to gray, but most cannot be identified to species.

Size: 12 — 25 mm 

Photo by: Glenn Marangelo on 5/15/22 in Missoula, MT