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=YiPNBQAAQBAJ&pg=PA51&lpg=PA51&dq=Polyphylla+decemlineata+of+mexico&source=bl&ots=e1pdlzsGpU&sig=8uF28pbS-3hce6dnpgYVoa-L7Bo&hl=de&sa=X&ved=0ahUKEwig3PDAjLnMAhVFaRQKHacQDTYQ6AEIUDAH#v=onepage&q=Polyphylla%20decemlineata%20of%20mexico&f=false
https://mexiconuevo.wordpress.com/2009/06/28/ten-lined-june-beetle-polyphylla-decimlineata/
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