232 Wisconsin Academy of Sciences, Arts, and Letters. 
Eupeodes Osten Sacken 
43. E. volucris 0. S. St. Croix and Marathon Counties. 
Didea Macquart 
44. J). fasciata Macq. Milwaukee and Vilas Counties. 
Syrphus Fabricius 
1. All the abdominal bands interrupted or greatly incised-... 
Bands on third and fourth segments, at least, entire.... 
2. Face with a black shining median line, at least on lower part.. 
Face entirely yellowish above upper mouth opening. 
3. Basal pair of abdominal spots very small, widely separated, 
all the spots triangular; abdomen narrow. oronoensis 
Basal pair of spots larger, not so widely separated, other spots 
nearly square ... disjectus 
4. Abdomen narrow, basal pair of spots large, whitish. 
Abdomen oval, basal spots not larger than others, usually more 
yellowish .... 
5. Smaller species, 8 mm., basal spots large and nearly square, 
very narrowly separated, the other spots narrowly linear, 
pile of pleurae white . .fisherii 
•Larger species, 10 mm., basal spots are more triangular; pile 
of pleurae yellowish . (umbellatarum) 
6. Spots on third segment joined by a very narrow line, those 
on the fourth more broadly connected—the yellow spots 
or bands occupying the greater part of the segments, 
thorax metallic green .species no. 1 
Spots of abdomen distinctly separated, thorax deep metallic 
blue . 
7. Third longitudinal vein distinctly curved into first posterior 
cell pile of pleurae yellow, a single biarcuate black band 
above the antennae . arcuatus 
Third vein nearly straight, pile of pleaurae white, two rounded 
separated spots above antennae.. .perplexus 
8. Second and third abdominal bands reach side margins. 
Bands separated from side margins. 
9. Bands more or less attenuated before reaching side margins.. 
Bands going over the side margins in practically their full 
width ... 
10. Hind femora yellowish or reddish, at least on basal half. 
Hind femora black on basal half. 
11. Eyes hairy, faintly so in the female. torvus 
Eyes distinctly glabrous ....... 
2 
8 
4 
3 
5 
6 
7 
9 
20 
10 
16 
13 
11 
12 
