DIPTERA OF THE EXPEDITION 



BY D. W. COQUILLETT 



The series of Dipterous insects collected by Professor Trevor 

 Kincaid while a member of the Harriman Expedition to Alaska 

 during the summer of 1899 is one of the most interesting and 

 valuable collections of insects of that order that the U. S. Na- 

 tional Museum has acquired for many years. The specimens 

 themselves, almost without exception, are in first-class condi- 

 tion, and each is accompanied by a label giving the exact lo- 

 cality and date of capture. 



The collection contains 2,423 specimens, representing 276 

 species, distributed in 138 genera and 36 families. One genus 

 and 63 of the species are believed to be new to science, and are 

 described in this paper. In addition to the specimens referred 

 to above, there are a number of others which it is quite impos- 

 sible to correctly classify in the present condition of the science ; 

 these are chiefly female specimens belonging to groups in which 

 the sexes are very dissimilar in appearance, and the principal 

 classificatory characters are present in the male sex alone, ob- 

 scure groups which have not as yet been thoroughly studied in 

 this country, and for the proper elucidation of which several 

 years of careful study will be required. 



[389] (3) 



