326 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 12 



Table IV — Number op Days Beet Leafhopper Lived Without Food During 



Winter 



Date Number 

 E. tenella of 



began fast E. tenella 



Nov. 22 60 adults 



Dec. 11 30 nymphs 



Dec. 11 50 adults 



Dec. 11 50 adults 



Acknowledgements 



The writer is deeply indebted to Mr. W. J. Hartung, agriculturist of 

 the Spreckels Sugar Company, for data furnished and credited to him 

 in this paper, and numerous courtesies extended during the work. 

 Mr. W. W. Thomas, plant pathologist of the same company, accom- 

 panied the writer on most of the trips until he was called into the 

 United States Army on August 7. The writer is under special obliga- 

 tions to Mr. S. P. Parish and to various members of the botanical 

 department of the University of California for the determination of 

 the plants mentioned in this paper. 



Bibliography 



1. Ball, E. D., 1917. The Beet Leafhopper and the Curly Leaf Disease that It 



Transmits. Utah Agr. Exp. Sta. Bui. 155, pp. 1-56. 



2. Boncquet, p. a., and Hartung, W. J., 1916. The Comparative Effect upon 



Sugar Beets of Eutettix tenella Baker from Wild Plants and from Curly Top 

 Beets. Phytopathology, V, No. 6, pp. 348-349. 



3. Severin, H. H. p., and Thomas, W. W., 1918. Notes on the Beet Leafhopper 



{Eutettix tenella Baker). Jour. Econ. Ent. XI, No. 3, pp. 308-312. 



4. Smith, R. E., and Boncquet, P. A., 1915. Connection of a Bacterial Organism 



with Curly Leaf of the Sugar Beet. Phytopathology, V, pp. 335-343. 



BIOLOGICAL NOTES ON THE FLATHEADED APPLE TREE 

 BORER (CHRYSOBOTHRIS FEMORATA FAB.) AND THE 

 PACIFIC FLATHEADED APPLE TREE BORER (CHRYSO- 

 BOTHRIS MALI HORN) 



By H. E. Burke, Specialist in Forest Entomology, Forest Insect Investigations, Bureau 

 of Entomology, U. S. Department of Agriculture 



Practicallj' every article written in America on apple insects or even 

 general fruit insects mentions Chrysohothris femorata as an injurious 

 enemy of the apple and other fruit and shade trees. Very few, how- 

 ever, ever mention mail which according to our records is far more 

 common and injurious in the Pacific states than femorata. Numerous 

 rearings have given us femorata from the prune and plum a few times 

 and mall from the currant, apple, plum, prune, cherry, peach and 



