PKELIMIXAEY CLASSIFICATIOX OF SCOLYTOIDEA. 



191 



In Division II of the Ipidse the presence of the seminal valve and 

 absence of the seminal rod predominate. The valve is present in 20 

 genera and 44 species and the rod is absent in 20 genera and 43 spe- 



cies. The valve is absent in 2 genera and 4 species and the rod is 

 present in 6 genera and 12 species. The combination of rod and 

 valve is found in 4 genera and 10 species. 



