VOL. 24 JUNE, 1922 No. 6 



PROCEEDINGS 



OF THE 



ENTOMOLOGICAL SOCIETY 



OF WASHINGTON 



X 

 CONTENTS 



AI.DRICH, J. M. A NEW GEN'US OF TWO-WINGED FLY WITH MANDIBLE-LIKE 



LABELLA 145 



CRAMPTON, G. C. THE DERIVATION OF CERTAIN TYPES OF HEAD CAPSULE 



IN INSECTS FROM CRUSTACEAN PROTOTYPES 153 



SCHAUS, W. NEW SPECIES OF PYRALIDAE OF THE SUBFAMILY CRAMBINAE 



FROM TROPICAL AMERICA 127 



SNODGRASS, R. E. MANDIBLE SUBSTITUTES IN THE DOLICHOPODIDAE . . . 148 



PUBLISHED MONTHLY EXCEPT JULY, AUGUST AND SEPTEMBER 



BY THE 



ENTOMOLOGICAL SOCIETY OF WASHINGTON 



U. S. NATIONAL MUSEUM 



WASHINGTON, D. C. 



Entered as second-class matter Marcli 10, 1919, at the Post Office at Washington, D. C., under 



Act of August 24. 1912. 



Accepted for mailing at the special rate of postage provided for in Section 1103, Act of October 

 3, 1917, authorized July 3, 1918. 



