Fluke—Syrphidae of Wisconsin. 
223 
Chrysotoxum Meigen 
Lateral margin of the third abdominal segment entirely yellow- * 
....... laterale 
Lateral margin of the third segment never entirely yellow, usually 
black .. pubescens 
2. C. laterale Loew. One female from Price County which has 
the second joint of the antennae shorter than the first and 
third. Sides of the third segment of the abdomen nar¬ 
rowly yellow; all bands touch the side margins. Bases of 
front and middle femora black. 
3. C. pubescens Loew. One female from Madison, Dane County, 
August 13, 1918. Figure 4. This specimen indicates a 
linking between laterale and pubescens , as Johnson in 
Psyche (1907, p. 78) has already noted. The specimen I 
have labeled pubescens is 13 mm. in length, and has the 
lateral margins of the third abdominal segment yellow in¬ 
terrupted. The bases of the front and middle femora are 
somewhat tinged with black, especially toward the outside. 
The specimen is very close indeed to the female in the 
Milwaukee Public Museum called laterale. 
Chrysogaster Meigen 
1. Base and tip of tibiae, or at least first two joints of tarsi, 
yellow or yellowish red; last section of fourth longitudinal 
vein rectangular; antennae elongate. 2 
Legs wholly black; last section of fourth vein curved or bent, 
third joint of antennae nearly rounded, front of female 
strongly rugose . nigripes 
2. Eyes with linear markings, last section of fourth vein joins the 
third beyond the tip of the second vein, rectangular with a 
stump of a vein in the middle; second joint of the antennae 
nearly as long as the third..... nitida 
Eyes unicolorous, last section of fourth vein joins third oppo¬ 
site or before the tip of the second. 3 
3. Cross-veins of the wings clouded, antennae distinctly longer than 
from base of antennae to upper mouth edge, i. e., longer 
than the face. pictipennis 
Cross veins of wings not clouded, antennae scarcely as long as 
from base of antennae to upper mouth edge, i. e., not longer 
than the face. pulchella 
4. C. nigripes Loew. Milwaukee and Washington Counties. 
Figure 5. Also recorded from N. Y., N. J., Conn., N. C., 
Nebr., and Que. 
