380 LST er ZOOLOGICAL WORKS 
inconspicuous flowers of Restiaceae, Cyperaceae, and Grcntiiede not bela aa q 
taken into consideration. There is a greater poverty of flower-visiting insects 
in the Alps of Australia than in those of Europe.) Vict. Nat., Melbourne, xx, 
1903, pp. 64-70. 
109. Wiedemann, C. R. W. Aussereuropiische zweifliigelige Insekten. Two parts. 
Hamm, 1828, 1830. 
110. Williston, 8. W. Synopsis of the North American Syrphidae. Smithsonian 
Inst., Nation. Mus. Bull., Washington (D.C.), Nr. 31, 1886, pp. 1 et seqq. | 
111. Manual of the families and genera of North American Diptera. Ed. 2. New ~ 
Haven, 1896. 
112. Wytsman, P. Catalogue systématique des Passalides. Ann. Museo civ. st. nat., 
Genova, i, 1884, pp. 326-47. 
