Monosteira unicostata(Mulsant & Rey) (Hemiptera: Tingidae) Established in North America, with a Key to the Genera of Tingidae in Canada

Monosteira unicostata is reported as established in British Columbia, and thus is a new alien species in North America. It has also been intercepted in Ontario on imported grapes. A description of M. unicostata and a key to the genera of Tingidae in Canada are provided to help distinguish this adventive species from other Canadian Tingidae. This brings the total adventitive Tingidae in this country to six.