CONTENTS 



New Aphididae from California. By Albert F. Swain . 1 



(Issued March 28, 1918.) 



Neotropical Bees, principally collected by Professor Bruner 



- in Argentina. By T. D. A. Cockerell . . .25 



(Issued March 30, 1918.) 



Costa Rican Diptera, collected by Philip P. Calvert, Ph. D., 

 1909-1910. Paper 3.— A Report on the Ephydridae. 

 By E. T. Cresson, Jr. . . . . .39 



(Issued April 4, 1918.) 



The Genus Corythucha Stal (Tingidae ; Heteroptera) , By 



Edmund H. Gibson 69 



(Issued April 4, 1918.) 



