THE INSECT FAUNA OF THE GENUS CRATAEGUS 1089 



THEOBALD, FRED V. The app'e blossom weevil. In The insect and other 

 allied pests of orchard, bush, and hothouse fruits, and their prevention 

 and treatment, p. 104-110. 1909. 



WELLHOUSE, WALTER H. Xanthonia villosula Melsh. injuring forest 

 trees. Journ. econ. ent. 12:396-397. 1919. 



Memoir 52, Studies in Pollen, with Special Reference to Longevity, the fourth preceding number in this 

 series of publications, was mailed on March 9, 1922. 



