It's a good life.
I think you're going to find it difficult to ID them by the exuviae. Some limited keys exist (I found one for eight species in Brazil), but most of what I can find says it's usually difficult to pin down a genus that way, let alone a full species. I suppose it would be easier if you lived in a place that had very few cicada species to begin with. But then that wouldn't be very much fun...
Could it be a male and a female, hence the size difference?
jason,You're probably right. I usually ID cicadas by song rather than appearance -- don't guess that helps in this case ;)Ellen,I don't believe these two are the same species, but I'll check that out.
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