250 Wisconsin Academy of Sciences, Arts, and Letters. 
-. 1910. Some additions to Dipteran fauna of New England. 
Psyche 17 : 229-231. 
——. 1916. On the Criorhinja< intersistens Walker and an allied spe¬ 
cies. Entom. News 24: 293-5. 
-. 1916. Some New England Syrphidae. Psyche 23: 75. 
Metcalf, C. la. 1913. Syrphidae of Ohio. Ohio Biol. Surv. J: no. 1. 
-. 1916. Syrphidae of Maine. Maine Agr. Exp. Sta. Bull. 253. 
-. 1917. Syrphidae of Maine. Maine Agr. Exp. Sta. Bull 263. 
Moodie, R. L. 1905. A new Milesia from Arizona with notes on 
some Wyoming Syrphidae. Entom. News 16 : 138-143. 
Osbnm, R. C. 1910. Studies on Syrphidae. I. Syrphus arcuatus 
Fall, and a related new species. Jour. N. Y. Entom. Soc. 18 : 55. 
-. 1915. Studies on Syrphidae. IV. Species of Eristalis new to 
America with notes on others. Jour. N. Y. Entom. Soc. 23: 139— 
145. 
Robertson, C. 1901. Some new Diptera. Canad. Entom. 33: 284. 
Verrall, G. H. 19 01. British flies. Vol. VIII. London. Indispens¬ 
able in a thorough study of the family. 
Walton, W. R. 1911. Notes on Pennsylvanian Diptera, with two 
new species of Syrphidae. Entom. News 22: 318—320. 
Williston, S. W. 188 6. .Synopsis of the North American Syrphidae. 
U. S. Nat. Mus. Bull. 31. This work is the basis of all North 
American studies of Syrphidae. I am always using it; most of 
the keys in this paper are based on those of Williston’s. 
-. 1908. Manual of North American Diptera, 3rd edition. Syr¬ 
phidae on pages 246—260. I have quoted almost verbatim from 
this work for the table of genera given above. 
