The Haliian species was introduced in the TNG episode, “Aquiel“. They are a telepathic species, although their telepathic powers are limited to empathy. They may use a crystal called canar to enhance their abilities. They celebrate many festivals on their home planet, and are members of the Federation. Extrapolating from what we observe of Aquiel Uhnari, they may also experience symbolic dreams that, if interpreted correctly, give them insight into their current situations.
STA Haliian (PDF)