I took these photos around noon in mid August in Hsinchu county Taiwan. I've seen many dragonfly varieties but I've never seen anything like this before.
Its body is about 5 cm long and very thin compared to the ones shown in the related questions below. The midsection looks strangely shaped to me, as if it is bent upwards in the back and suddenly ends, and a very thin "tail section" was then added below it.