444 THE MONTHLY BULLETIN. 



Valley, California. In one case some Bartlett grafts had quite a heavy 

 infestation. Apparently, however, it is of no importance except as a 

 root pest of pear trees, and only rarely occurs above ground. 



WINGED LICE. 



On August 24. 1913, the alate form of this louse was taken on pear roots 

 in Lake County, and on September 29th, of the same year, additional 

 collections were made in Napa County. Mounts of these were made for 

 microscopic study and a careful examination of the species did not 

 reveal any differences that would separate it from the apple species. 



These few observations, while not at all extensive, and insufficient to 

 justify many conclusions, have shown that Eriosoma lanigera occurs 

 very commonly on pear trees, over a large area in California; that in 

 many orchards it is a pest of considerable importance; that control 

 measures in the orchard would be extremely difficult, and that care 

 should be exercised to plant uninfested nursery stock. 



