A new species and new records of Tetranychidae (Acari: Trombidiformes) from Saudi Arabia, with a key to world species of Mixonychus Ryke and Meyer Author Khan, Eid Muhammad Acarology Laboratory, Department of Plant Protection, College of Food and Agriculture Sciences, King Author Kamran, Muhammad Acarology Laboratory, Department of Plant Protection, College of Food and Agriculture Sciences, King Author Alatawi, Fahad Jaber Acarology Laboratory, Department of Plant Protection, College of Food and Agriculture Sciences, King text Acarologia 2019 2019-11-18 59 4 492 506 http://dx.doi.org/10.24349/acarologia/20194349 journal article 10.24349/acarologia/20194349 2107-7207 5173848 Sonotetranychus daleae (Tuttle and Baker) Anatetranychus daleae Tuttle and Baker, 1968: 110 . Sonotetranychus daleae (Tuttle and Baker) , Tuttle, Baker and Abbatiello, 1976: 70 . Material examined — Two females, Vachellia nilotica , Taif , 21°30.112’N , 040°29.118’E , elevation 1483 m , 11 September 2017 , coll. E. M. Khan and M. U. Rehman; two females , Vachellia nilotica , Taif , 21°20.474ʹN , 040°19.325’E , elevation 1838 m , 11 September 2017 , Figure 7 Mixonychus ( Bakerina ) aculus (Chaudhri) , adult female: Palp. Scalebar = 50 μζ. coll. E. M. Khan and M. U. Rehman; five females , Vachellia nilotica , Taif , 21°14.372ʹN , 040°31.135’E , elevation 1618 m , 13 September 2017 , coll. E. M. Khan and M. U. Rehman. Nine females (KSMA-ARL-19/20-29) have been deposited at King Saud University Museum of Arthropods ( KSMA , Acarology section), Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, Riyadh , Saudi Arabia . Distribution — Mexico , Pakistan , Taiwan and United States of America (Migeon and Dorkeld, 2006−2018). Known hosts — Dalea formosa (Fabaceae) (the type host, native to southwestern USA and Mexico ), Psorothamnus emoryi (Fabaceae) (native to southern USA and Mexico ) and Vachellia nilotica (Mimosaceae) (Migeon and Dorkeld, 2006−2018).