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Scantius aegyptius
Listed on Center for invasive species research website: "The most noticeable impact of S. aegyptius in California will likely be the presence of large numbers of nymphs and adults migrating from drying annual weeds into adjacent developed areas. These migrations consisting of thousands of individuals can be very conspicuous and lead to large aggregations on small patches of host plants causing concern to local residents who notice these obvious aggregations."
Oak woodland
Beautiful insect!! Here is a link to the species: http://bugguide.net/node/view/299939