

CONTENTS 



Editorial Notes 



I 



I. Notes on Costa Rican Formicariida. 



By M. A. Carriker, Jr. s 

 II. Vertebrate Fossils from the Fort Union Beds. 



By Earl Douglass i i 

 III. A Preliminary List of the Lepidoptera of Western 

 Pennsylvania Collected in the Vicinity of 



Pittsburgh. By Henry Engel 



27 



