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Polyphylla decemlineata
Scarabaeidae, Melolonthinae, Melolonthini, Polyphylla sp. and "must" be Polyphylla decemlineata. I only have found 1 Mexican reference, but it is quite a widespread species in Western US.
http://bugguide.net/node/view/310691
https://books.google.ch/books?id=YiPNBQA...
https://mexiconuevo.wordpress.com/2009/0...