52 THE UNIVERSITY SCIENCE BULLETIN. 



It should be mentioned here, however, that even in the 

 case of these four varieties minor differences were observed 

 and further study to ascertain the limits of variation in the 

 genitalia of this group might make changes in the position in 

 which we at this time leave these varieties. For the present 

 though it seems best to leave them as varieties. The three 

 which here are given specific rank are, however, very distinctly 

 good species. 



It should also be mentioned here that in the larger group- 

 ings there is more or less uniformity in the form of the geni- 

 talia. This is not true of all the groups. But in some cases, as 

 for example in the Typhlocybini, we find the styles charac- 

 teristic of the group. 



Thus in the larger groups, the genera, the species, and in 

 the varieties, we find in a study of these organs much that 

 either confirms our present disposition of the members of 

 this family, or else that shows us how to improve in our 

 classification. All that this paper shows is simply the possi- 

 bility along this line. As previously stated, the real value of 

 such studies can only be shown when genera are treated in 

 their entirety. This it is hoped will be done for many, if not 

 all the groups, in the years to come. 



