It looks like a new generation of beetles will soon be on the way. Adults and larvae like to feed on willows, poplars, and (as you might guess) cottonwoods. They can be found throughout the US, including Alaska, in areas where their host plants exist. The adults overwinter and emerge in early spring to begin feeding on the new leaf growth. Females will lay lemon-yellow colored eggs in clusters of between 15 to 75 eggs on the underside of leaves. Depending on the latitude, they can have from two to several generations a year.
Photos by: Kristi DuBois on 6/12/21 in Missoula, MT