38o LIST OF ZOOLOGICAL WORKS 



are white, lo green, 13 yellow, 6 dark yellow, 7 purple and red, i blue : the 

 inconspicuous flowers of Restiaceae, Cyperaceae, and Gramineae not being 

 taken into consideration. There is a g^reater 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. Aussereuropaische zweifliigelige Insekten. Two parts. 



Hamm, 1828, 1830. 



110. 'Williston, S. W. Synopsis of the North American Syrphidae. Smithsonian 



Inst, Nation. Mus. Bull., Washington (D. C), Nr. 31, 1886, pp. i et seqq. 



111. Manual of the families and genera of North American Diptera. Ed. 2. New 



Haven, 1896. 



112. Wytsman, P. Catalogue systematique des Passalides. Ann. Museo civ. st. nat., 



Genova, i, 1884, pp. 326-47. 



