 It is found in Southern California, including the northern Baja California and the Channel Islands, north to the Okanagan Valley, southern British Columbia, eastwards through southwestern Idaho to western South Dakota and northern Utah.Adults of "T. unicolor" feed at honeydew secretions and flowers.Females have been captured at honeydew from galls of "Disholcapsis eldoradensis" on "Quercus lobata" and at flowers of "Asclepias erosa", "Baccharis sarothroides", "Chrysothamnus" sp., "Lepidospartum squamatum", and "Wislizenia refracta".