TABLE OF CONTENTS 
VOLUME X, 1912 
Proceedings. t 
In Memoriam (Karl Herman Doerflinger) by Paul H. Dernehl. 8 
The Tropisms and their Relation to More Complex Modes of Behavior. By 
S. J. Holmes. 13 
Reconstruction of the Chalcidid Genus Hypopieromalus Ashmead of the 
Family Pteromalidae. By A. A. Girault. 24 
Townsend’s Solitaire in Wisconsin. By Henry L. Ward. 47 
A Contribution to the Natural History of the Amphipod, Hyalella knicker- 
bockeri (Bate). By Hartley H. T. Jackson... 49 
Data from Experiments on Parthenogenetic Animals. By Nathan Fasten. . 61 
The Chalcidoid Family Trichogrammatidae. By A. A. Girault. 81 
Anon the Reasons for Bird Migration. A Favorite Food Theory. By A. 
C. Burrill. 10? 
Observations of the Behavior of Eubranchipus dadayi. By A. S. Pearse. . . 109 
Some Notes on the Habits and Distribution of Wisconsin Crawfishes. By 
S. Graenicher. 118 
Economic and Biologic Notes on the Giant Midge: Chironomus ( Tendipes) 
plumosus Meigen. By A. C. Burrill. 124 
New Species of Dragonflies. By Richard A. Muttkowski. 164 
Records of Wisconsin Diptera. By S. Graenicher. 171 
