Really old dragonfly: http://en.wikipedia.org/wiki/Meganeura

Meganeura is a genus of extinct insects from the Carboniferous period approximately 300 million years ago, which resembled and are related to the present-day dragonflies. With wingspans of up to 65 cm (25.6 in), M. monyi is one of the largest known flying insect species; the Permian Meganeuropsis permiana is another. Meganeura were predatory, and fed on other insects, and even small amphibians.

Whats really interesting is that the amount of oxygen in the air impacts the size of insects.

There was a study where by increasing the amount of oxygen in the air, in just a few generations, insect were gaining as much as 10% in size.

Wow! Thanks for the info..here the dragon flies have a span of maximum say, something under 10 cm...so, was surprised to see something at 63 cm..

You must have some weird looking squirrels where you live.

Not exactly where I live, but there's a mountain nearby and I recently happened to go trekking, there were some giant squirrels - At the size of an average puppy dog, or an over-grown cat...