VOL. XXXVII, No. 433 



January, 1903 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 



L The Water Snakes of Southern Michigan . Professor H. L. CLARK 1 

 II. New or Hitherto Unknown Ephemerid Nymphs of the Eastern United 



States EDWABD W. BEEEY 25 



in. On the Classification of Certain Groups of Birds . Dr. E. W. SEUFELDT 33 



IV. Hats from the Nootka Sound Eegion . CHAELES C. WIL10UGHBY 65 



V. Notes and Literature : General Biology, Morgan's " Regeneration," Inheri- 71 



tance of Acquired Characters — Zoology, The Habits of Fishes, Develop- 72 

 ment of the Face, Pectoral Appendages of Birds, Spiders of the United 



