“Primate” (** out of four) was a middling horror thriller about a group of friends (Johnny Sequoyah, Jess Alexander, Troy Kotsur, and others) whose tropical vacation turns deadly when a rabid gorilla turns against them and infects them one-by-one leading to their descent into madness. Reasonably well-directed and has a few occasional scares but takes too long to get going and doesn’t pay off enough when it does. Good and spooky music score by Adrian Johnston is a definite plus throughout.