The distributional ranges of many species of Bremidae meet or overlap in Manitoba. The distribution of most of these species is shown to follow closely the summer isotherms, which, in general, run in a northwest to southeast direction. Three main areas are recognized, each characterized by the presence or absence of certain species: (1) southern, (2) central, (3) northern and eastern. In the latter, three sub-areas are indicated. In all, 23 species of Bremidae are recorded from the province.