This is the first book in color on the plant and stored mite predatory mite family Phytoseiidae and the sister group ectoparasitic parasitic insect associated mite family Otopheidomenidae. Hundreds of line drawings with clear instructions in color are given making self study or teaching of these two families very easy. This book is very useful to anyone working on mites, trying to identify these mites, or planning to teach acarology.