From publisher blurb:
Horrors abound in this tome of psionic monsters for use in your Pathfinder Roleplaying Game campaign!
From the tiny, yet dangerous puppeteers, to the huge thought slayer, psionic monsters for every level of play are included. Create an entire campaign out of the insidious phrenic scourge, or simply drop in an encounter with the carnvivorous mathara tree while the party is out exploring.
Find the classic psionic monsters like the brain mole to the psion killer, as well as dozens of brand new, never-before-seen monsters like the skull thrasher and the deep hound, or psionic dragons like you've never seen them before, all within the pages of the Psionic Bestiary! Finally, there are a few select feats to make the monsters (and perhaps a few PCs) scarier.