There is a site listed at the end of this message - please refer to this site for a detailed explanation for species identification and separation.

There is a line bisection test implementing the wing veins as "mappable" characters. This test is used to separate T. linnei from T. pruinosus (and other related Tibicen species). Keep in mind this test was designed using material collected in the upper Midwest; however, this test seems to be challenged when applied to Taxa in the Southeast. I have noticed that while the point of bisection varies in T. pruinosus specimens, it nearly always bisects the cell somewhere across the last third or quarter of the wing cell beyond the junction of the Sc & C (Midwestern conventions suggest no bisection at all). In contrast the line will bisect near or before the junction of the Sc (Sub-costal)& C (Costal) in all T. linnei I have examined from all parts of this species' range.

Please refer to the following site for wing test - scroll down and you'll see diagrams explaining which veins are used.
http://insects.ummz.lsa.umich.edu/fauna/Michigan_Cicadas/Michigan/key.html

Feel free to contact me for additional images of these species to help clarify other traits used in comparisons.

The contrast was toned down from the original photo. The halo effect is caused by merging different exposures together, which i haven't figured out how to get rid of yet.