Key to the females of the genus Mixozercon

1. Opisthonotal J-, Z- and S-setae situated on small setal bases....................................................................................... 2

- Opisthonotal J-, Z- and S-setae situated on enlarged setal bases (Figs 25, 26, 27) ...................................................... 4

2. Setae J1-J2 and Z1 smooth; dorsal cavities saddle-like, with smooth anterior margin ................................................ 3

- Setae J1-J2 and Z1 pilose; dorsal cavities with undulate anterior margin................ Mixozercon stellifer (Aoki, 1964)

3. Setae J3-J4 pilose, similar in shape and length to J5 ....................................... Mixozercon sellnicki (Schweizer, 1948)

- Setae J3-J4 smooth, distinctly shorter than J5 .................................................. Mixozercon heterosetosus Balan, 1995

4. Setae J1 and Z1 smooth; posterior ends of peritrematal shield truncated between the level of R1 and R2, straight ....................................................................................................................................................................................... 5

- Setae J1 and Z1 pilose; posterior ends of peritrematal shield expanded beyond the level of R3, rounded (Figs 7, 8) .. ...................................................................................................................................... Mixozercon jasoniana sp. nov.

5. Post-genital sclerites present; setae J5 inserted anterior to dorsal cavities, their tips not reaching posterior margin of idiosoma; J setae region ornamented with irregular pits or depressions (Figs 1, 25) ..................................................... ................................................................................................................................... Mixozercon albertaensis sp. nov.

- Post-genital sclerites absent; setae J5 inserted between outer dorsal cavities, their tips reaching slightly beyond posterior margin of idiosoma; J setae region with subtriangular ornamentation arranged in circles (Figs 12, 27) .......................................................................................................................................... Mixozercon borealis sp. nov.