The spider mites of the genus Banks (Acari, Trombidiformes, Tetranychidae) from Saudi Arabia: two new species, a re-description, and a key to the world species.

Two new species of the genus Banks are described and illustrated based on adult females and males, from Forssk (Leguminosae), from Hochst. ex Endl. (Cupressaceae), and Attiah, 1967 is redescribed from H. Wendl. (Arecaceae). Additionally, the intraspecific morphological variations within populations, collected from 28 various host plants and 80 different localities from six regions of Saudi Arabia from 2009 to 2017, are discussed and presented. The genus is divided into two species groups based on the presence of one seta ( group) or two setae ( group) on coxa II. In addition, seven species are suggested as synonyms of (Klein, 1936) and Iqbal & Ali, 2008 is considered as species inquirenda. A key to all known species of the genus is provided.