CONTENTS OF VOLUME IV. 
Proceedings 5 
A Turtle Pipe from Wisconsin. By Henry L. Ward 9 
Some Notes on the Pollination of Flowers. By S. Graenicher 12 
The Chemical Nature of Some Insect Secretions. By A. L. 
Melander and C. T. Brues 22 
Observation on a Pied Kat. By Henry L. Ward 37 
List of Lepidoptera Occurring in Milwaukee County. By "Valen- 
tine Fernekes 39 
In Memoriam — Adolph Meinecke 59 
Proceedings 63 
Notes on Wisconsin Mollusca. By George H. Chadwick 67 
Two New Species of Phoridre. By Charles T. Brues 100 
Descriptions of Parasitic Hymenoptera from Cape Colony. By 
Charles T. Brues 103 
Notes on The Herring Gull and The Caspian Tern. By Henry L. 
Ward 113 
A Contribution to our Knowledge of the Visual Memory of Bees. 
By S. Graenicher 135 
Notes and Descriptions of North American Parasitic Hymenoptera. 
II. By Charles T. Brues 143 
On The Habits and Life-History of Leucospis affinis Say. By S. 
Graenicher 153 
A Bemarkable Ceremonial Object from Michigan. By Henry L. 
Ward 160 
Notes on The Fossil Fish-Spine, Phlvctsenacanthus telleri Eastman. 
By Edgar E. Teller 162 
