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Platycorynus peregrinus
Found this in madumalai forest reserve, south India.
Chrysochus cobaltinus is a species from western North America (USA and Canada), not found anywhere near India. In tropical Asia, there is the genus Platycorynus, closely related to Chrysochus, distinguished by the shape of the antennae (last five segments flattened and widened in Platycorynus, not so in Chrysochus). There are several blue-metallic species of Platycorynus in India, so I'm not able to tell which one it is exactly.