PREFACE. 
VTI 
of life call now no longer be interchanged and all people and states are suffering m consequence. I lit 
and also the effects of same in the post-war period, have adversely influenced the study of natural sciences 
and the pursuit of science as a hobby. It is satisfactory to record that just of late one can observe the 
the first signs and symptoms of a revival of interest in these matters. After a period of stagnation lasting 
about a decade, this change is to be welcomed and it is no doubt due to the unabated enthusiasm of the old 
brigade of nature lovers, naturalists and collectors, as well as the old established entomo ogica SOCK ies arK 
clubs that this has been brought about. In spite of the craze for sport, it is necessary to interest and attrac 
youth and secure fresh recruits as students of entomology. It is to he hoped that from now onwarc sues la 
see an ever growing interest in science. 
The gratifying reception accorded to these Supplementary Volumes and the steady progiess of 
Work give us cbnfidence and courage to continue our task from the completion of which nothing can now 
deflect us. 
Darmstadt, December 1933. 
Dr. Adalbert Seitz. 
