INTRODUCTION 



As a result of these investigations there has been published 

 in the Proceedings of the Washington Academy of Sciences a 

 series of sixteen papers based upon the entomological material 

 thus distributed. Two others are here published for the first 

 time. The writer, as entomologist of the Expedition, wishes to 

 thank the various authors for their promptness in reporting upon 

 this material. 



On bringing together the data derived from these several 

 sources, it was found that the number of species included in the 

 entire collection was approximately 1,000, of which 344 were 

 considered by the specialists to whom they were intrusted to be 

 new to science. Descriptions of these new forms will be found 

 in the following pages. The list also includes over twenty spe- 

 cies hitherto recorded only from Europe, thus adding to the 

 growing list of insects known to exist upon both the American 

 and European continents. 



The number of previously described species, new species, 

 and total number of species collected, arranged by orders, are 

 here given. 



An effort was made to record, while in the field, such data as 

 seemed worthy of preservation as a preliminary study of the 

 biology of Alaska insects. It was hoped that some observa- 

 tions might be made bearing upon the adaptations of these forms 

 of life to the peculiar climatic conditions of the coastal regions of 

 Alaska. At Sitka, for instance, the annual precipitation attains 

 the enormous total of 105 inches, and at Unalaska, in the 

 Aleutian Islands, it is but little less. Another feature con- 



