%V***/^ OCTOBER 1917 



Vjfe*** 8 *^* Vol. XXXI, No. 7. 



THE ^- 



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. Tavkrner, 



Anthropology. Entomology. Ornithology. 



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



Botany. Geology. Palaeontology. 



Prof. John Macoun, M.A., Otto Klotz, LLD.. C. Gordon Hewitt, D.Sc, 



Conchology. Meteorology. Zoology. 



CONTENTS: 



A New Genus and Species of Crestless Hadrosaur from the 



Edmonton Formation of Alberta. By L. M. Lambe 65 



The Red-tailed Hawk in Manitoba. By Norman Criddle 74 



Was the Lower Cambrian Trilobite Supreme? By L. D. Burling 77 



Programme of Winter Lectures, 1917-1918 79 



Why the Leaves Change Their Color 80 



The Dadson-Merrill Press, Limited. 

 issued December 24TH, 1917- 



Entered at Ottaiva Post Office as second class matter. 



