What years since 1970 have the Cicadas come to the surface to mate in Abilene, Tx?
Sacramento County California
Every year there will be cicadas present in suitable habitat. There are over 170 different species of cicada in North America north of Mexico. See this web site for more detail-
Many species of cicada have an annual or multi-year life cycles. However, the two most famous species are periodical cicadas, which have 13 year http://bugguide.net/node/view/511588 and 17 year http://bugguide.net/node/view/57935 life cycles. I don't think those species are present in Abilene, TX. You can learn more about cicada species distributions in this publication available for download here http://bugguide.net/node/view/1016428
I would think that every year in Abilene you would have the large dogday cicadas calling for mates on hot summer days. http://bugguide.net/node/view/1099330