June, '09] journal of economic entomology 261 



series of original figures and process reproductions. The author is to be 

 congratulated upon having made substantial additions to our knowledge of 

 these two forms. 



The Semitropical Army Worm, by F. H. Chittenden and H. M. 

 Russell. U. S. Dep't Agric, Bur. Ent. Bull. 66. Prt.. 5. p. 53-70, 

 1909. 



This bulletin gives in detail the life history and habits of Prodenia eridania 

 Cram., a common southern injurious species which appears to have hitherto 

 escaped notice to a large extent. The insect and its operations are admirably 

 depicted by a series of original illustrations. 



Whitefly Studies in 1908, by E. W. Berger. Fla. Agric. Exp't 

 Sta. Bull. 97 p. 41-71. 1909. 



This is a revision of Bulletin 88, with important additions. A most inter- 

 esting feature is the discussion of the various fungi affecting white flies and 

 the description of a new species, Aleyrodes nubifera. previously confused with 

 the common A. citri. 



Biological Studies of Three Species of Aphididae, by J. J. Davis. 

 U. S. Dep't Agric, Bur. Ent. Tech. Ser. No. 12. Prt. 8, p. 123-68, 

 1909. 



An extended biological study of the corn root aphis, Aphis maidi-radicis 

 Forbes, the corn leaf aphis, Aphis maidis Fitch and the sorghum aphis, Sipha 

 flava Forbes. The life history of each species has been worked out in detail, 

 the food habits, the number of generations and the productivity of each being 

 indicated by a series of admirable tables. Each account is accompanied by 

 an extended bibliography. The presentation of a large amount of data in such 

 a concise and comprehensive manner is most admirable. 



Economic Loss to the People of the United States Through 

 Insects that Carry Disease, by L. 0. Howard. U. S. Dep't Agric, 

 Bur. Ent. Bull. 78, p. 1-40, 1909. 



This comprehensive discussion from a broad viewpoint treats particularly 

 of malaria, yellow fever and typhoid fever and the losses caused by the 

 dissemination of these infections through the agency of certain insects. The 

 chapter on endemic diseases and their effect on the progress of nations from 

 Ross, with Doctor Howard's comments thereupon, is a most fitting conclusion 

 to an admirable summary of the situation. This bulletin should be widely 

 read by laymen as well as by professional men. 



Fruit Trees and Their Enemies, with a Spraying Calendar, by 

 Spencer Pickering and Fred Y. Theobald, p. 1-113, 1908. 



This is a summarized account, admirably printed on good paper, of the 

 various enemies affecting fruit trees, including not only insects and fungi 

 but birds, mammals and frosts. The introductory matter, while important, is 

 relatively much more extended than the necessarily very brief discussions of 

 the various species. Judged from the American standpoint, the work would 



