Identification key to the male of the Mexican Fannia pretiosa -group species

1. Mid tibia with anterior apical seta ⅔ the length of basitarsus (Fig. 1A). Hind coxa with two posterior setae (Fig. 1C)...... 2

-. Mid tibia with anterior apical seta half the length of basitarsus (Fig. 1B). Hind coxa bare posteriorly (except in F. grisalesae sp. nov. which has 0–1 setae) (Fig. 1D)...................................................................... 3

2. Fore tarsi yellow and enlarged dorsoventrally (Fig. 7D). Mid tibia without posterodorsal seta. Hind tibia with 4 anteroventral setae (Fig. 7F)................................................................. Fannia amplitarsis sp. nov.

-. Fore tarsi brown and not enlarged dorsoventrally. Mid tibia with 1 submedian posterodorsal seta. Hind tibia with 3 anteroventral setae (Fig. 10F)................................................................... Fannia bisetata sp. nov.

3. Syntergosternite with 2 pairs of curved lateral setae twice longer than sternite 5 (Fig. 1E)............................ 4

-. Syntergosternite without any pair of curved lateral setae longer than sternite 5 (Fig. 1F)............................. 5

4. Wing hyaline (Fig. 2B)......................................................... Fannia abdominiseta sp. nov.

-. Wing brownish (Fig. 8B).......................................................... Fannia anguliseta sp. nov.

5. Hind femur strongly curved dorsoventrally (Fig. 9F; 12F). Tuft of posteroventral setae curled apically (Fig. 9F).......... 6

-. Hind femur slightly curved dorsoventrally (Fig. 11F; 13F). Tuft of posteroventral setae straight apically................ 7

6. Fore tarsi brown (Fig. 9D). Mid tibia without posterodorsal setae. Hind femur without a tuft of anteroventral setae (Fig. 9F). Mid basitarsi not enlarged. Hind tibia with 4 anteroventral setae (Fig. 9F)..................... Fannia arcuata Chillcott

-. Fore tarsi yellow, except tarsomere 1 and 5 brown (Fig. 12D). Mid tibia with 1 submedian seta. Hind femur with a tuft of anteroventral setae (Fig. 12F). Mid basitarsi with the basal fourth enlarged and covered with four long and thick curved setae (Fig. 1G). Hind tibia with 5 anteroventral setae (Fig. 12F)................................ Fannia grisalesae sp. nov.

7. Fore tarsi yellow, except for basal half of tarsomere 5 brown (Fig. 11D). Mid basitarsi enlarged ventrally (Fig. 1H)...................................................................................... Fannia gilvitarsis Chillcott

-. Fore tarsi yellow, except for tarsomere 5 brown (Fig. 13D). Mid basitarsi not enlarged ventrally.................................................................................................. Fannia pedregalensis sp. nov.