The Phytoseiidae are among the best-known mite families, with more than 2,700 recorded species worldwide. Some of those phytoseiids are used as biocontrol agents to fight agricultural pests. But in order to study their potential, it has become urgent to first establish a reliable taxonomy of Phytoseiidae. This book presents a general review of the classification and external morphology of the family Phytoseiidae in Taiwan and neighboring islands. Between 2009 and 2019, more than 20,000 specimens were gathered over the course of 2,500 collections. This book focuses on 64 species belonging to three subfamilies and fourteen genera, among which are five novel species and eight newly-recorded species; it provides their descriptions and illustrations, as well as information on their habitat plants and food habits.