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Lethocerus indicus
This giant diving beetle weighed in at 52 g and was very near to 9 cm long and 3 cm wide. It was a deep chesnut brown with a yellow orange stripe on both sides and a few on the back. Dytiscidae is my guess for now.
This one was living in our school swimming pool but normally found in ponds and still water around Chennai.
Thanks for the assistance my students will appreciate this... Thanks! Everyone.... :)