Key to species of the Empis (Enoplempis) mira species group

1 Scutum usually with single median brown vitta (sometimes not clearly visible due to preservation); male right hind femur with two elongate posteroventral tufts, as long as width of femur (Fig. 29); hypandrium with medial apical notch (Idaho, Oregon, Washington).................................................................... E. williamturneri sp. nov.

– Scutum usually with or without several vittae; male right hind femur with one elongate posteroventral tuft as long as width of femur (Figs 23, 25, 27, 31); hypandrium without median apical notch (California)................................. 2

2 Scutum with row of dark spots at base of the dorsocentral setae [females unknown for E. submira].................... 3

– Scutum with dark or pale vitta at base of the dorsocentral setae................................................. 4

3 Male right hind femur with anteroventral digitiform lobe on apical third, clothed in short setae (Figs 8, 24); right hind tibia with subapical swelling directed vertically, with black thorn-like setae (Fig. 24)............................ E. mira (Bigot)

– Male right hind femur without anteroventral digitiform lobe (Fig. 26); right hind tibia with subapical swelling directed horizontally, without black thorn-like setae (Fig. 26)................................................. E. submira sp. nov.

4 Male right hind femur without anteroventral setae opposite subapical swelling on tibia (Fig. 30); male and female mid femur with long posteroventral setae at most slightly longer than width of femur (Fig. 11); hypandrium with broad rectangular apical notch; subepandrial process short, extending less than half distance to epandrial margin (Fig. 40); female hind femur with anteroventral preapical setae not longer than hind tibia width (Fig. 35)............................ E. winkleri sp. nov.

– Male right hind femur with long anteroventral setae opposite subapical swelling on tibia (Fig. 22); male and female mid femur with long posteroventral setae more than twice width of femur (Fig. 10); hypandrium with arched apical margin; subepandrial process long, extending more than half distance to epandrial margin (Fig. 36); female hind femur with anteroventral preapical setae longer than hind tibia width (Fig. 32)............................................... E. macdonaldi sp. nov.