CONTENTS 
Contributions toward a Monograph of the Mutillidae and 
their Allies of America North of Mexico. IV. A Re- 
view of the Myrmosidae. By James Chester Bradley 247 
(Issued August 21, 1917) 
Costa Rican Diptera Collected by Philip P. Calvert, Ph. D., 
1909-1910. Paper 2. Tabanidae and Asilidae. By 
James S. Hine. ....... 291 
(Issued August 21, 1917) 
A Contribution to the Knowledge of the Dermaptera of 
Panama. By Morgan Hebard. .... 301 
(Issued September 10, 1917) 
On Orthoptera from the Vicinity of Rio de Janeiro, Brazil. 
By James A. G. Rehn . . . . . . 335 
(Issued September 24, 1917) 
