REPORT OF TME SOCIETY 17 



differentiated and carefully studied, chronological records collected and the 

 limits of distribution fairly well determined." 



Marlatt's work deals not only with the appearance of the different 

 broods in the different districts, so that it is known when any particular 

 brood will appear in a district, but also with the structure, transformations, 

 feeding habits, nature of injuries, natural enemies, and methods of control. 



Although not one of the great masterpieces "The Periodical Cicada" 

 is, I consider, a work of more or less monographic completeness. It lacks 

 some of the more modern features of a monograph, namely the embryological 

 development and the anatomical structure of the different stages of the 

 insect. 



"The Spring Grain Aphis or 'Green Bug' " by Webster and Phillips 



Perhaps no family of insects has received greater attention in recent 

 years than the Aphididae, and as a result several very carefully prepared 

 bulletins have been published. One of the first and most complete of such 

 aphid bulletins was prepared by F. M. Webster and W. J. Phillips of the 

 U. S. Bureau of Entomology and issued in 1912 as Number 110. Viewed 

 from the two standpoints of completeness and economic importance the 

 bulletin stands high in my estimation. Every phase of the life-history of 

 the Spring Grain Aphis is dealt with very fully, and a complete record is kept 

 of the number of viviparous and oviparous generations and the number of 

 individuals of each generation. The problems of diffusion and parasitism 

 are treated satisfactorily, while a new feature is introduced when a thorough 

 investigation is given of the embryological developinent. 



Later Aphis publications of great value are: 



"The Oat Aphis," by J. J. Davis, (Bui. 112) 1914. 



"The Yellow Clover Aphis," by J. J. Davis, (Tech. Ser. 25) 1914. 



"The Pea Aphis," by J. J. Davis (Bui. 276) 1915. 



"Woolly Apple Aphis," A. C. Baker, Kept. 101, 1915. 



"Apple Aphids," A. C. Baker. 



"Apple Aphids," Parrott, N. Y. Agr. Exp. Stn. 



"Apple Aphids," Matheson, Cornell Exp. Stn. 



"Apple Aphids," Patch, Maine Exp. Stn. 



"Cabbage Aphis," Herrick, Cornell Exp. Stn., 1911. 



