June, '17] 



DAVIDSON: REDDISH-BROWN PLUM APHIS 



Comparative Measurements (mm.) 



353 



*Joint III evidently represents combined III and IV of later forms. 



The discussion following was by R. W. Doane, H. E. Burke and E. 0. 

 Essig. 



Chairman A. W. Morrill: The next paper will be presented by- 

 Mr. Geo. P. Gray. 



LABORATORY AND FIELD TESTS OF CALIFORNIA 

 PETROLEUM INSECTICIDES 



By Geo. P. Gray, Berkeley, Cal., and E. R. deOng, Davis, Cal. 



(Withdrawn for publication elsewhere) 



This paper was discussed by A. W. Morrill and other members of the 

 house. 



Chairman A. W. Morrill: The next paper will be presented by 

 Mr. Stanley B. Freeborn. 



