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



Eupeodes. 

 E. volucris Osten-Sacken. Milwaukee, Marathon and Burnett Cos. 



Didea. 

 D. fasciata Marcquart. Milwaukee Co. 



Syrphus. 



S. americanus Wiedemann. Milwaukee, Washington, Doug-lass and 



Burnett Cos. 

 S. arcuatus Fallen. A specimen of this fly, var. lapponicus was taken 



by Dr. G. P. Barth at Milwaukee, April 26, 1908. 

 S. disjectus Williston. Doug-las and Burnett Cos. 

 S. grossularia? Meigen. Milwaukee Co. 

 S. ribesii Linne. Milwaukee, Washington, Marathon, Douglas and 



Burnett Cos. 

 S. torvus Osten-Sacken. Milwaukee Co. 

 S« umbellatarum Osten Sacken. Milwaukee, Marathon and Burnett 



Cos. 

 S. xanthostoma Williston. Milwaukee Co. 



AHograpta. 

 A. obliqua Say. Milwaukee, Washington and Douglas Cos. 



Xanthogramma. 



X. aequalis Loew. 1 female specimen, Door Co., July 6, 1905. Frontal 

 stripe to base of antenna? broad, covering a greater part of the 

 surface than the yellow. On posterior margin of thorax 2 widely 

 separated yellow spots. Length 12 mm. 



X. divisa Williston. Milwaukee, Eacine and Burnett Cos. 



X. emarginata Say. Milwaukee, Douglas, Burnett and Polk Cos. Ex- 

 tremely variable as the following specimens from Milwaukee 

 show. Male, Sept. 5, 1908 : Typical, spots of 2nd abdominal 

 segment attenuated near the lateral margins, and touching the 

 latter. Female, Aug. 11, 1906 : Bands of segments 2, 3 and 4 

 reaching the lateral margins. Band on segment 2 hardly inter- 

 rupted, little attenuated laterally. Bands on segments 3 and 4 

 more attenuated, on 3 emarginate, on 4 narrowly interrupted. 

 Female, Sept, 5, 1908 : Similar to the last, but bands on segments 

 3 and 4 more attenuated, that on 4 touching the lateral margin 



