VJ PREF& E. 



1915," by II. F. Wilson and V. L. Lovett-, "Guide to California 

 Insects," by C. W. Woodworth; "Manuftlof Fruit Insects," by M. V. 

 Slingerland and C. R. Crosby; "Tnsects Injurious to Fruits," by 

 W. Saunders : "Injurious Insects'' by ^W. C. O'Kane, and many 

 other works. The bibliography is 4 -••■"K in -hided in the footnotes 

 which are numbered consecutively throu.Jioht. All references are 

 also indexed under the author's name m the general index. 



Five copies of the manuscript were prepared and sent to specialists 

 with the request that the contents be severely criticised and such 

 corrections and suggestions made as slmS*d be required to make the 

 finished product accurate and reliable. Thus the entire copy has 

 passed through the hands of many experts with the most gratifying 

 results and is really the product of many workers. For the very 

 valuable assistance rendered- in this connection the author wishes 

 to express his sincere appreciation and thanks ; to the members of 

 the California Stat/ Commission of Horticulture and especially to 

 the commissioner, Dr. A. J. Cook, who has made the publication of 

 both editions possii>e; to Mr. Geo. P. Weldon, chief deputy com- 

 missioner; to Mr. Harry S. Smith, superintendent of the State Tnsec- 

 tary, and to Mr. E. J. Vosle«< secretary of the commission, for reading 

 all of the manuscript and (proof; to Mr. Vpsler also for superin- 

 tending the printing; to Pro'i. C. W. Woodworth, University of Cali- 

 fornia, and Prof. R. W. Dfea^, Stanford University, for looking 

 over the manuscript; to Dr. R. V. Chamberlin, Harvard University, 

 for revising the Diplopoda, Symphyla and Chilopoda-, to Mr. Geo. P. 

 Weldon also, for revising the Aracknida and the article on the fruit- 

 tree leaf-roller; to Mr. Nathan Banks, United States Department of 

 Agriculture, for revising the Arachnida and the Neuropil ra ■, to Mr. 

 Paul R. Jones, San Francisco, Cal., for looking over the Thysanoptera 

 and writing the methods of controlling the pear thrips (the scientific 

 names of the thrips have been taken from the writings of Mr. J. D. 

 Hood); to Prof. Lawrence Primer, University of Nebraska, and 

 Mr. A. X. Caudell, United States National Museum, for revising the 

 Orthoptera; to Prof. R. W. Doane, Stanford University, and Mr. Geo. 

 A. Coleman, University of California, for revising the Corrida; to 

 Prof. C. P. Gillette. Colorado Agricultural College, Mr. John June 

 Davis, United States Department of Agriculture, Prof. H. F. Wilson, 

 Oregon Agricultural College, and Mr. W. M. Davidson, United States 

 Department of Agriculture, for a very careful revision of the Aphidida ; 

 1o Mr. E. P. Van Duzee, University of California, for looking over the 

 Cicadidm, Membracidaz, Jassida and Heteroptera (the recent works of 

 Prof. A. L. Quaintance and Mr. A. C. Baker, United States Depart- 

 ment of Agriculture, have been followed in the classification of the 

 Aleyrodida) ; to Dr. Edwin C. Nan Dyke, University of California, 



