114 Annals Entomological Society of America [Vol. XV, 



FOURTH SESSION. 



The Society was called to order at 2:00 P. M., December 28th, in 

 Room 10 of the Medical Building. President Aldrich introduced Dr. 

 Seymour Hadwen, of the United States Biological Survey, who pre- 

 sented the Annual Address on the Subject, "Northern Oestridae." 



Dr. Aldrich then introduced Dr. C. J. S. Bethune, an Honorary 

 Fellow of the Society and long-time Editor of the Canadian Entomol- 

 ogist, who was very warmly greeted by the audience. 



FIFTH SESSION. 



The final session of the 1921 meetings was a joint session with the 

 Entomological Society of Ontario, at which Mr. Arthur Gibson, Pres- 

 ident of the Entomological Society of Ontario and President-elect of 

 the Entomological Society of America presided. The Session met at 

 3:00 P. M., December 28th, in Room 10 of the Medical Building, and 

 the following papers were presented : 



Algonquin Days. F. J. A. Morris, Peterborough, Ontario. 



Ecdysis in Tmetocera ocellana. S. W. Frost, Arendtsville, Pa. 



Cocoon Spinning by Species of Buccnlatrix. O. A. Johannsen, Cornell Uni- 

 versity. 



The Ventral Prothoracic Gland of the Red-humped Apple Caterpillar 

 (Schizura concinna). J. D. Detwiler, Western University. 



Are There Two Species of the Oyster-shell Scale? Grace H. Griswold, 

 Cornell University. 



The Phylogeny of the Gall Mites and a New Classification of the Suborder 

 Prostigmata of the Order Acarina. H. E. Ewing, United States National Museum. 



An Extreme Case of Delayed Fall Emergence of Hessian Fly {Phytophaga 

 destructor). W. H. Larrimer, United States Bureau of Entomology. 



Importance of Insects in the Food of the Brook Trout. W. A. Clemens, 

 University of Toronto. 



The Efifect of Vitamines on the Growth of Ephestia kuehniella in Wheat Flour. 

 Charles H. Richardson, U. S. Bureau of Entomology. 



Adjournment. 



