PREFACE 



IT was originally intended to publish the entomological re- 

 sults of the Expedition in a single volume, but when the reports 

 from the various specialists came in, the quantity of matter was 

 so great that it was found necessary to divide it into two volumes. 

 The present volume contains papers on the Diptera, Tenthred- 

 inoidea, Sphegoidea, Vespoidea, Formicidae, and Hymenoptera. 

 In the latter group, Mr. Ashmead tells us, less than 30 species 

 were known from Alaska prior to the Harriman Expedition, 

 while the number here recorded is 335, of which 201 are de- 

 scribed as new to science. This extraordinary increase is due 

 almost wholly to the indefatigable activity of the entomologist 

 of the Expedition, Professor Kincaid. 



C. HART MERRIAM, 



Editor. 



WASHINGTON, D. C., 

 May f, 



(v) 



