Fluke—Syrphidae of Wisconsin. 
217 
Table of Genera (after Williston) 
(Genera marked with an asterisk are not known to occur 
in Wisconsin.) 
1. Antennae with a terminal style. 
Antennae with a dorsal (rarely subterminal) arista. 
2. Antennae cylindrical, the first two joints elongated; first pos¬ 
terior cell with a stump of a vein (Geria).. 
.SPHYXIMORPHA (p. 249) 
First two joints of the antennae short. 
3. Eyes bare; small species.*Pelecocera 
Eyes pilose; larger species.*Callicera 
4. Marginal cell of the wings closed and petiolate. 
Marginal cell open... 
5. Anterior cross-vein of the wings distinctly before the middle of 
the discal cell, almost always rectangular. 
Anterior cross-vein near or beyond the middle of the discal cell, 
usually oblique . 
6. Antennae elongate (if arista plumose, see 56). 
Antennae short ... 
7. Mesonotum with yellow lateral stripes; large species, the abdo¬ 
men always with distinct yellow bands. chrysotoxum (p. 223) 
Mesonotum not with distinct yellow lateral stripes or margins.. 
8. Face rounded, not tuberculate, pilose; oral margin not project¬ 
ing . 
Face not evenly arched; tuberculate or the oral margin not pro¬ 
jecting . 
9. Moderately large to large species; scutellum flattened, often 
with spines or tubercules on its border; a stump of a vein 
in the first posterior cell from the third longitudinal vein.. 
Small species; scutellum without spines; no stump of vein in 
first posterior cell. Pipiza (p. 224) 
10. Abdomen much narrowed at the base... 
Abdomen not or but little narrowed at the base.MiCRODON (p. 222) 
11. Face swollen and prominent below.*Rhopalosyrphus 
Face not swollen and prominent below.*Mixogaster 
12. Body clothed with sparse tomentum; all the femora thickened 
and with spinous bristles below (Lepromyia) .*Lepidostola 
Body not clothed with flattened tomentum; the femora not thick¬ 
ened with spinous bristles below. 
13. Face partly or wholly yellow, tuberculate below, the epistoma not 
projecting; face and front not wrinkled. Paragus (p. 225) 
Front and face black in ground color. 
14. Face black in ground color. 
Face more or less yellow in ground color... 
2 
4 
3 
48 
5 
6 
55 
7 
14 
8 
9 
12 
10 
11 
13 
19 
15 
26 
