Why not go for one of the extinct dragonflies: [Meganisoptera](https://en.wikipedia.org/wiki/Meganisoptera) had a wingspan of 71 cm (28") and was a predator just like today's...

All predators have more than moderate mental aptitude anyway, so pushing the limit a bit wouldn't be too hard...

[![enter image description here][1]][1]

*Source:* linked Wikipedia article.

  [1]: https://i.sstatic.net/8h6Yg.jpg