INVESTIGATION OF INTRODUCTION WORK. 53 



ber of the Academy of Science of Hungary and formerly director of the entomological 

 station of Hungary. The last two gentlemen are entirely familiar with the two moths 

 and their parasites. 



Dr. Richard Heymons, extraordinary honorary professor and custodian at the Zoo- 

 logical Museum of the Royal Institute of Berlin. Dr. Heymons has made a large 

 study of the injurious insects of central Europe, and particularly of their natural 

 enemies. 



Prof. A. Severin, conservator at the Royal Museum of Natural History of Belgium, 

 and member of the Superior Council of Forests. Prof. Severin's position is naturally 

 that of one of the best posted entomologists, particularly with reference to dangerous 

 forest insects. 



In addition to these foreign entomologists, Prof. Filippo Silvestri, 

 of the Royal Agricultural School of Portici, Italy, visiting America 

 on an official mission in the summer of 1908, visited Boston, and 

 was asked to give his professional opinion of the work, his report 

 being printed in the fourth annual report of the superintendent, 

 issued January, 1909, by L. H. Worthle\ r , acting superintendent. 



It is worthy of note that Prof. Silvestri had been commissioned by 

 the R. Accademia dei Lincei and by the royal minister of agriculture 

 of Italy to investigate the work in economic entomology being done 

 in the United States, and had visited all portions of the county, 

 including California and Hawaii, studying with especial care all the 

 work being done with parasites. It should be pointed ou,t also that 

 the California claims were perfectly Well understood by all of the 

 American experts, Mr. Ehrhorn himself being the second ranking 

 officer in the California service, and the others having either visited 

 California partly for the purpose of investigating this work, or being 

 perfectly familiar with the situation by 5 study of the publications and 

 by correspondence. Moreover, of the foreign experts, Mr. Froggatt 

 had just come from California on an investigating trip for the gov- 

 ernment of the Federated Colonies of Australia which subsequently 

 carried him around the world, Mr. Lounsbury had visited California 

 for the purpose of studying this work, and Dr. Fletcher had repeat- 

 edly visited that State. 



The reports of all of these experts, with the exception of that of 

 Prof. Silvestri, are published in the third annual report of the Massa- 

 chusetts superintendent, Boston, 1908, Prof. Silvestri's report being 

 published, as above stated, in the fourth annual report of the super- 

 intendent. 



It will be entirely unnecessary to quote from these reports, since 

 they may be found in full in the State documents mentioned. It 

 will suffice to state that the work was commended, it is safe to say, 

 with enthusiasm by every individual. Specific consideration was 

 given to the California suggestion by Mr. Lounsbury, by Mr. Frog- 

 gatt, and by Prof. Slingerland. Suggestions were made by several 

 of them that the study of the fungous, bacterial, and protozoan 

 diseases of the larvae should be taken up. Dr. Felt and Dr. Smith 



