146 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



THREE HUNDRED AND FOURTH MEETING, MAY 3, 1917. 



The 304th regular meeting of the Society was entertained by 

 the Society members from the Federal Horticultural Board at the 

 Saengerbund Hall, May 3, 1917. There were present Messrs. 

 Abbott, Baker, Barber, Boving, Busck, Cushman, Dietz, Ely, 

 Fisher, Gahan, Carman, Greene, Kotinsky, Middleton, Morrison, 

 Paine, Rohwer, Sanford, Sasscer, Schwarz and Wood, members, 

 and R. M. Fouts and Edwin P. Selkregg, visitors. 



Mr. Shirley L. Mason, of the U. S. Entomological Laboratory, 

 West Lafayette, Indiana. Dr. Henry T. Fernald of Amherst, 

 Massachusetts and Mr. Max Kisliuk of Ohio State University, 

 Columbus, Ohio were elected corresponding members. Under the 

 head of program the following were presented: 



THE USES OF INSECT GALLS. 



BY MARGARET M. FAOAN. ! 



A CONTRIBUTION TO THE BIOLOGY OF N. A. DIPTERA. 



BY CHARLES T. GREENE, 

 Forest Insect Investigations, Bureau of Entomology. 



The Diptera discussed in this paper was reared by the writer 

 at the Eastern Field Station, Falls Church, Va. All the species 

 discussed below remain in the larval stage during the winter. 

 The larva of My das clavatus and Dasyllis thoracica are predaceous 

 on Coleopterous larvae, therefore they are of importance. The 

 larva of Dasyllis is a secondary wood-borer in addition to being 

 predatory. All of the above species are known in the adult stage 

 but their seasonal history and habits are entirely new. 



Neopachygaster maculicornis Hine. 

 Ohio Naturalist, II. p. 228. 



The larvae were collected at Falls Church, Va., November 29, 

 1912, by the author. They were found under the bark of Tulip 

 (Liriodendrori) in the sap, on the moist surface between the outer 

 wood and bark. The exact time of pupation is not known but is 

 sometime in early spring. The adults emerged between May 23 

 and June 3, 1913". 



Lnrca (plate XVII, Jig. -) 



Larva. Grayish-brown, flattened and somewhat chitinous. The entire 

 surface of the larva, except the head, is marked in a very minute way, 



1 Withdrawn for publication elsewhere. 



