CONTENTS. 
Proceedings. 
The Tropisms and their Relation to More Complex Modes of 
Behavior . . . . . . By S. J. Holmes 
Reconstruction of the Chalcidid Genus Hypopteromalus Ashmead 
of the Family Pteromalida . . By A. Arsene Girault 
Townsend’s Solitaire in Wisconsin ... By Henry L. Ward 
A Contribution to the Natural History of the A.mphipod, Hyalelia 
Knickerbockeri (Bate) . . By Hartley H. T. Jackson 
Data from Experiments on Parthenogenetic Animals . By Nathan Foster 
The Chalcidoid Family Trichogrammatidae . By A. A. Girault 
Anon the Reasons for Bird Migration : A Favorite Food 
Theory . . . . . , By A. C. Burrill 
Actual date of Publication, Sept. 12, f912. 
