1911] Graenicher. Wisconsin Diptera. Supplement. 69 



Paragus. 



P. bicolor Fabricius. Three males and one female from Prescott 

 (Pierce Co.) Williston (Syn. N. Am. Syrphidw, p. 19) refers to the 

 variability of this species. The color of the abdomen in the female 

 from Prescott is slightly red on the fifth segment only. Of the three, 

 males one has the abdomen distinctly red from the second segment on ; 

 the second is only faintly red on these parts ; the third has the 

 abdomen black, with a reddish tint on the sides near the apex. 



P. tibialis Fallen. Two males and one female from Hudson (St. 

 Croix Co.), one male and two females from Prescott (Pierce Co.). This 

 species is just as variable as the preceding one. In all three males 

 the abdomen is red from the third segment on. One of the females 

 (Hudson) has an entirely black abdomen, and in the other two some 

 red is visible on segments three and four. 



Platychirus. 

 P. hyperboreus Staeger. One specimen from Prescott (Pierce Co.). 

 P. quadrat us Say. Specimens from Hudson (St. Croix Co.), 

 Maiden Rock (Pierce Co.) and Fountain City (Buffalo Co.). 



Melanostoma. 

 M. mellinum Linne. One from Hudson (St. Croix Co.), two from 

 Maiden Rock (Pierce Co.), and one from Fountain City (Buffalo Co.). 

 In all of these the legs are yellow, and have a very faint brownish 

 ring on the hind femora only. 



Eupeodes. 



E. volucris Osten-Sacken. One from Hudson (St. Croix Co.). 



Syrphus. 

 S. americanus Wiedemann. Specimens from St. Croix, Pierce and 

 Buffalo Cos. This and the following species are common, and probably 

 of general occurrence throughout Wisconsin. 



A. ribesii Linne. Specimens from Pierce and Buffalo Cos. 



Allograpta. 

 A. obliqua Say. Common everywhere. Specimens from St. Croix 

 and Pierce Cos. 



Mesogramma. 



M. geminata Say. Prescott and Maiden Rock, both in Pierce Co. 

 M. marginata Say. Extremely abundant. Specimens from St. 

 Croix, Pierce and Buffalo Cos. 



