1910.] NATURAL SCIENCES OF PHILADELPHIA. 685 



rearranged, together with the duplicate Hymenoptera, the collection 

 of galls and the Dipterous family Stratiomyidse. 



A large part of the Micro-lepidoptera has been relaxed and mounted 

 and nearly the entire series of North American Rhopalocera has been 

 rearranged. Much of the Hemiptera has been recently studied and 

 named by a specialist. The incorporation of the additions to the 

 collection has taken much time, and the Section is indebted to those 

 students not directly responsible for the work. 



Mr. Rehn has had charge of the Orthoptera and Dr. Calvert has 

 continued to care for the large and valuable collection of Odonata. 

 Mr. E. T. Cresson is working on the arrangement of parts of the col- 

 lection of Hymenoptera. 



The Conservator represented the Academy at the First International 

 Entomological Congress, held in Brussels, Belgium, last August. 



This meeting demonstrated the great importance of entomology 

 from a practical or economic standpoint, particularly that branch of 

 economic entomology relating to the dissemination of disease by 

 insects and the carriage of germ diseases to man. 



The following persons were elected officers to serve for the ensuing 

 year : 



Director Philip Laurent. 



Vice-Director H. W. Wenzel. 



Treasurer E. T. Cresson. 



Conservator Henry Skinner. 



Recorder Henry Skinner. 



Secretary E. T. Cresson, Jr. 



Publication Committee E. T. Cresson, 



E. T. Cresson, Jr. 



Botanical Section. 



Five double wooden cases, which had to be moved from the north 

 room owing to the change of windows on Race Street, were transferred 

 to the local herbarium, the plants contained in them being moved 

 into new dust- and insect-proof metal cases. But little work has been 

 done on the arrangement of the herbarium owing to the remodelling 

 of the building, though the preparation and mounting of specimens 

 has gone on with but little interruption. 



Some important additions have been made to the collections during 

 the year. The Conservator spent about a month in Jamaica and brought 

 back a collection of more than 850 sheets. Mr. Joseph Crawford spent 



