Procyon is the name of a binary star system, not too far from Sirius, in canis minor, about 11.4 light years away.
Both Alex Collier and George Andrews claim that the Procyons recently got into a fight with Greys, and had to chase them from their world. This explains their frequent interaction with contactees on Earth where they warn about the activities of the Greys.
Joshua Stone calls them a benevolent humanoid race. Supposedly, they have contacted the US government, but the US wasn't interested because the Procyons didn't want to share their technology.
(Branton's information on them is completely contradictory !!!)