VOL. VI. MAY, 1920 NO. 9 



AME^TCAN MIDLAND 



NATURALIST 



Devoted to Natural History, Primarily^^ ,— ^ 



that of the Prairie States / "» \ 



^UN 1 6 1920 • 



Published by the University of Notre Dame, ^^ , 



Notre Dame, Indiana 



J. A. NIEUWLAND, C. S. C, Ph. D., Sc. D., Editor 



CONTENTS 



The Hackberry Stage of the Upper Devonian. (Plate I.) 



CarroH Lane Fenton 179 



A Consideration of Certain Genera Proposed by Ehrhart 



Homer D. House 200 



Birds Observed at Notre Dame, Indiana, in the Fall of 1919 



Brother Alphonsus, C. S. C. 208 



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