PREFATORY NOTE. 



In the present Bulletin the papers on the Pselaphidee and 

 on the Loess fossils are brought to completion. I'he second 

 number of this volume ma}- be expected in June, 1891. 



S. Calvin. 



Editors^ 



T. H. McBride. 

 C. C. Nutting. 

 B. Shimek. 



H. F. WiCKHAM. 



State University of loxm, Nov. ist, i8go. 



