CONTENTS. 



PAGE. 



Table of Contents iii 



List of Officers v 



List of Members. Revised to December 31, 1909 vi 



1. Patrons. 



2. Honorary Members. 



3. Active Members. 



Abstract of History xviii 



Record. January 1, 1908, to December 31, 1909 xxii 



Papers Published. January 1, 1908, to December 31, 

 1909: 



1. Calvin M. Woodward. — Air-Ship Propeller Prob- 



lems. — Issued March 14, 1908 1 



2. Julius Hurter and John K. Strecker, Jr. — 



The Amphibians and Reptiles of Arkansas. — 

 Issued May 14, 1909 11 



3. William Trelease. — The Mexican Agaves known 



as Zapupe.— Plates I-VL— Issued May 18, 1909 . 29 



4. E. B. Branson. — The Fauna of the Residuary 



Auburn Chert of Lincoln County, Missouri. — 

 Plate VII.— Issued May 31, 1909 39 



5. H. E. EwiNG. — New North American Acarina. — 



Plates VIII-XL— Issued August 16, 1909 53 



6. Title Page. Prefatory Matter and Index of Vol. 



XVIII. Record January 1, 1908, to Decem- 

 ber 31, 1909.— Issued July 5, 1910. 



List of Authors 79 



General Index 80 



Index to Genera 82 



