4 CALIFORNIA STATE COMMISSION OP HORTICULTURE. 



collapse and die. This damage and loss might easily be overcome had 

 the grower possessed a slight knowledge of the nature and work of scale 

 insects, for remedial measures could have been applied at the first notice 

 of their presence and their ravages stayed. It is partly with the idea 

 of presenting this knowledge to the grower that the writer has deemed 

 it advisable to publish the following list of 132 species which have been 

 reported from this State, but of which list only 114 are actually found 

 here. This list, with the illustrations and descriptions, it is hoped will 

 enable the grower to recognize the destructive species and, with this 

 knowledge at hand, avoid the danger and loss which their presence, 

 unmolested, would eventually cause. 



By personally collecting over the State, and with the kindly assist- 

 ance of many residents of the State who are interested in the study of 

 Coccidse, and who have sent many specimens from various localities, 

 the writer has been able to bring together the present authentic list. 



The nomenclature of the " Coccidaj of the World," by Mrs. Fernald, 

 has been followed in connection with the classification of the species. 

 In this valuable work on Coccidse, California has been credited as the 

 habitat of several very destructive species which, in fact, are not to be 

 found in the State, having been reported from quarantine only; other 

 species are found only in greenhouses; and still others, the presence of 

 which I have personally investigated, are to be found in California 

 which are not given in the catalogue mentioned; these latter species I 

 have added to the list of California Coccidae. Undoubtedly additional 

 species could be added to the list by closer investigation and collecting, 

 as several new species are being prepared for publication, but which I 

 am sorry to say will not be completed in time for this report. Addi- 

 tional species will be added to the list from year to year as they are 

 discovered or described. The writer has only included the species 

 known to exist in California at the present time. 



For the descriptions and classification of the species mentioned the 

 writer has freely consulted most of the leading entomological works on 

 the subject of Coccidse, and wishes to acknowledge the aid received 

 from the efforts of the many able writers who have contributed to this 

 subject; also, takes this opportunity to thank all those persons who 

 have assisted in the work and made it possible to compile the present 

 list. 



While the primary object of this paper is to serve as a list for the 

 benefit of fruit-growers, at the same time it is hoped that it may be 

 useful to those students of Coccidae who are making a study of the Cali- 

 fornia forms. The scientific descriptions may not be of much benefit 

 to the former class, yet they are indispensable to the latter in deter- 

 mining species, and have been added to encourage the study of this 

 most important family. At the same time, the wa-iter has endeavored 



