I know this is a cicada, but I'm not sure which species. These emerged by the millions mid-June, 2007 in the mountains of western New Mexico where I've lived for two years. I did not see them the previous summer. They had a preference for the Pinon Pines but covered the house, power poles and just about everything else. The locals say that these emerge once every 3 years, some said 5 years. From what I read, periodic cicadas exist east of the Mississippi, but these were obviously west. Another smaller, dull brownish-gray cicada emerged at the same time. It prefered the Junipers and made a clicking sound.