LETTER OF SUBMITTAL. 



Crescent City, Fla., March 25, 1885. 



Sib: I have the honor to submit the following report upon insects 

 that affect the culture of the Orange. The investigations conducted un- 

 der your direction, and which form the basis of this report, were begun 

 upon my arrival in the field in Florida, in August, 1881, and continued 

 until March, 1882. The work was resumed in June, 1882, and 1 returned 

 to Florida in September, remaining in the field twenty-three months, 

 or until August, 1884. 



At your request, a preliminary report upon Scale-insects of the Orange, 

 with special reference to remedies and their application, was prepared 

 in advance of the final report, and was included in the Keport of the 

 Entomologist for 1882. 



A treatise upon Eust of the Orange, including the essential part of 

 Chapter VIII of this report, was prepared in the spring of 1883, and 

 short extracts from this and other portions of the final report have ap- 

 peared in the Bulletins of the Entomological Division. The full treatise 

 upon Eust, with illustrations, is included in the Annual Eeport of the 

 Entomologist for 1884. 



In the preparation of the present work a single object has been kept 

 in view, namely, to afford practical aid to the orange-grower in the war- 

 fare which must be waged with insect foes. Technical terms, which 

 might render the treatise unintelligible to non-entomological readers, 

 have been as far as possible excluded from the text, and in the descrip- 

 tions of insects which- fall within the scope of these investigations an 

 attempt has been made to render the various forms recognizable to an 

 intelligent observer, by the use of popular language, aided in many cases 

 by figures, and without a resort to intricacies of description, such as 

 would be imperatively demanded for specific identification. 



Nevertheless, that the work may not prove of less advantage to the 

 student of entomology, and to the investigator who may seek to correct, 

 advance, or complete the many imperfect observations here recorded, 

 references to more complete descriptions elsewhere published are 

 given when deemed necessary, and descriptions of new insects, with 

 other purely technical matters, are relegated to notes and appendices 

 at the end of the volume. 



Although my own observations have not extended beyond the State 

 of Florida, and the accessible notes of observers elsewhere are few and 



