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Chelymorpha alternans
Welcome Juan... I do not Know I get idea but I tried with Ladybug mimic Tortoise beetle and able to find this ID.
Good job Ashish!. And I'm very sure about the ID since Don Windsor is a world expert on Tortoise beetles.
Juan this link helped me to reach your spotting ID...
http://www.bioone.org/doi/abs/10.1206/00...