VOL. 20 



MARCH 1918 



No. 3 



PROCEEDINGS 



OF THE 



ENTOMOLOGICAL SOCIETY 



OF WASHINGTON 



CONTENTS 



CRAMPTON, G. C. THE THORACIC SCLERITES OF IMMATURE PTERYGOTAN 

 INSECTS, WITH NOTES ON THE RELATIONSHIPS INDICATED 39 



GAHAN, A. B. PROPACHYNEURON GIRAULT (HYMENOPTERA, CHALCI- 

 DOIDEA) . . . 6 



PUBLISHED MONTHLY EXCEPT JULY, AUGUST AND SEPTEMBER 



BY THE SOCIETY 



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BALTIMORE, MD. 



EDITORIAL OFFICE, WASHINGTON, D. C. 



Entered as second-class matter February 28, 1913 at the post office at Baltimore, Maryland, 



under the act of August 24, 1912. Acceptance for mailing at special rate of postage 



provided for in .Section 1103, Act of October 3, 1917, authorized 



on July 3, 1918. 



