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. Fuippo 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. Worthley, 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 country, 
including California and Hawaii, studying with especial care all the 
work being done with parasites. It should be pointed out 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*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 larvee should be taken up. Dr. Felt and Dr. Smith 
