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Tibicen Linnei
The costal margin/wing shape appears to be evenly arciform and suggestive of canicualris in this case. The muted coloration is also more typical of canicularis.
T. linnei in Wisconsin is usually smaller than linnei to the south, but characteristically much brighter green with strongly bowed wing margins.
Thanks! I thought it was dead but when I tried to take another picture it went away.