XXXll MONTHLY PROCEEDINGS. 



was with it a large cocoon, from which the young had escaped. The 

 specimen had escaped through accident, and he was unable to present 

 any details of its habits. 



Mr. E. M. Aaron recounted some experiments made on the eflFects of 

 temperature upon larvae. He found that by depressing the temperature 

 the development of the pupa was much retarded, and the colors of the 

 perfect butterflies made darker. 



Discussion having arisen regarding the transformation of the larva to 

 the pupa and the rapid changes in a short period, Mr. Aaron illustrated 

 the subject from the caterpillars and Dr. Horn continued with coleopter- 

 ous larvae. 



Dr. McCook moved the appointment of a Committee to make nomi- 

 nations for Officers and Committees for the coming year. Mr. Wilt, Dr. 

 McCook and E. M. Aaron, were chosen. 



Dr. McCook suggested that the Section express its approval of the 

 formation of a cabinet in the museum of the Academy illustrative of 

 the zoology of the vicinity of Philadelphia, and that the Section co-op- 

 erate in the preparation of an entomological department. Agreed to. 



The Chair announced that the next meeting would occur December 

 12th, following that of the American Entomological Society. 



December 12, 1883. 

 Vice-Director Dr. Horn in the chair. 



Dr. Horn announced the death of our Director, Dr. John L. LeConte, 

 on November 15th, aged 58 years, and spoke of his great services to 

 science and to this Section. As he had been requested to prepare a bio- 

 graphical sketch by a society of which Dr. LeConte had been longer a 

 member he thought it unadvisable that he should prepare one for this 

 Section but suggested that Dr. Scudder be requested to allow his sketch, 

 prepared for the National Academy, to appear in our publication. 



The Treasurer of the Section presented the following report: — 



Balance on hand Dec. 11, 1882 $27.62 



Received for dues (52.00 



89.62 

 Expenditures. 23.85 



Balance on hand 65.77 



which was referred to Messrs. Horn, Pine and Knight for audit. 



The Recorder read his annual report before its presentation to the 

 Academy. 



