* JUNE-JULY, 1917 



*S4&$&/$' Vol. XXXI. Nos. 3 4 4. 



THE ' vA-> 



OTTAWA 

 NATURALIST 



Published by The Ottawa Field-Naturalists' Club 



Editor: 



ARTHUR GIBSON, 

 Entomological Branch, Department of Agriculture, 



OTTAWA. 



Associate Editors: 



Harlan I, Smith. W. H. Harrington, P. A. Tavernbr, 



Anthropology. Entomology. Ornithology. 



SI. O. Malte, Ph.D., M. Y. Williams, Ph.D., L. M. Lambe, F.G.S.. 



Botany. Geology. Palaeontology. 



Prqf.JohnMacoun.M.A., Otto Klotz, LLD.. C. Gordon Hewitt, D.Sc, 



Conchology. Meteorology. Zoology. 



CONTENTS: 



The Trenton Fauna of Wolfe Island, Ont. By Kirtley 



F. Mather 33 



Notes on the Land Mollusca of De Grassi Point, Lake Simcoe, 



and other Ontario Localities. By E. M. Walker 40 



Peloria Flowers on Ivywort or Ivy-leaved Toadflax. By 



Blythe Hurst 45 



Disappearance of the Blue Gray Gnat-Catcher. By W. E. 



Saunders 45 



The Rough-winged Swallow near Ottawa. By C. L. Patch 46 



Notes 47 



The Dadson-Merrill Press, Limited. 

 issued August 14TH, 1917. 

 Entered at Ottawa Post OJice as second class matUr. 



