Last year, in October, I found several nymphs and adults together in just about the same location. The nymphs of this species vary and from what I understand there are three species of Acrosternum, all much alike, and there does appear to be some confusion over correct ID of the three species, all looking so similar. Anyway, here is a link to the adult, quite a striking insect: http://www.pbase.com/laroseforest/image/116915118