36 Bulletin Wisconsin Natural History Society. [Vol. 8, No. 1. 



Geron. 



G. calvus Loew. Milwaukee, Washington and Waukesha Cos. 

 G. subauratus Loew. 1 specimen taken at Randall, Burnett Co. 



SYRPHIDiE. 



Microdon. 



M. tristis Loew. Taken in Milwaukee Co... flying around the nests of 

 ants belonging to the genus Formica. 



Chrysogaster. 



G. nigripes Loew. Milwaukee and Washington Cos. 

 C. nitida Wiedemann. Milwaukee and Marathon Cos. 

 C. pictipennis Loew. Milwaukee and Marathon Cos. 

 C. pulchella Williston. Milwaukee, Eacine. Washington and Douglas 

 Counties. 



Pipiza. 



P. femoralis Loew. Milwaukee Co. A study of numerous specimens 

 from the Atlantic States has led Johnson to consider femoralis 

 and albipilosa different forms of one and the same species 

 (Psyche XIV, p. 75). A consideration of the 4 specimens taken 

 at Milwaukee points in the same direction. 1 male and 2 females 

 have the wings hyaline, slightly infuscated on the outer half. In 

 the remaining female the wings are conspicuously clouded 

 (albipilosa), and the insect is altogether darker than the typical 

 femoralis, having black antennae and darker legs. In one of the 

 females the interrupted yellow fascia across the 2nd abdominal 

 segment is about twice as broad as in the others. 



P. pistica Williston. Milwaukee and Burnett Cos. The distribution of 

 the yellow color on tibise and tarsi is very variable. 



Paragus. 



P. bicolor Fabricius. Milwaukee, Washington and Burnett Cos. 



P. tibialis Fallen. Milwaukee, Washington, Marathon and Burnett 



Cos. A female from the latter county (Yellow River, July 28, 



1909) has the face entirely dark. 



