Seven new species of the Aleiodes pilosus-group (=Tetrasphaeropyx Ashmead) are described and a key is provided for all known Canadian species in this group, as well as a new species found in North and South Dakota that is similar to one of the new Canadian species. Species described are as follows: A. argyllacearia, A. crassijugosus, A. dakotensis, A. dissiticarina, A. huberi, A. secwepemc, and A. sexmaculativorax. Species previously described and included in this key are A. anatariatus Fortier (2007), A. cartwrightensis Fortier (2007), A. halifaxensis Fortier (2007), and A. provancheri Fortier (2007).