CONTENTS. 



On the identity of the most common species of the family Tricho- 



grammatidae (Hymenoptera) . . . . By A. A. Girault 



A Synonymical Note (Odonata) . By Richard A. Muttkowski 



A Synopsis of the Type Specimens of Fossils from the Palaeozoic 



Formations of Wisconsin . . . By Edgar E. Teller 



Actual date of publication. May 20, 1912 



