Introduction. 



More than twenty-five years ago I took up the work of making a 

 card catalogue of the Tortricidae for the use of my husband, Prof. 

 C. H. Fernald, who had previously begun this task. Later the utility 

 of the catalogue became so evident that it was extended to include 

 'all orders of North American insects for use at the Hatch Experi- 

 ment Station. The Coccidai proved to be so important from an 

 economic standpoint, that it was decided to include for this family as 

 complete references as possible to all the scientific literature of the 

 world, and the convenience of such a catalogue to others has led to 

 its publication in this form. 



No references have been made in the present work, to literature 

 published before 1758, the date of the first volume of the tenth 

 edition of the Systema NaturEe of Linnaeus, except when such refer- 

 ences seemed to give necessary information. It has been difficult and 

 in some cases impossible to obtain or even find copies of a few 

 desirable works, and in some instances it was necessary to have cer- 

 tain papers copied from some of the larger European libraries. 

 Doubtless some important works may have been over-looked. All 

 references found in current newspapers not of a scientific standing 

 have been omitted, as have also the names and references to litera- 

 ture of the fossil Coccidae. With the exception of Targioni's Cat- 

 alogue, the names in which have been generally accepted, no refer- 

 ences to catalogues are given unless some new combination is made. 

 No references have been made to literature published after Feb. 28, 

 1903. Only those common names most generally in use in North 

 America have been given. 



The lists of food plants are far from complete as it was not practi- 

 cable to include all the plants upon which these insects feed, but 

 additional ones may be found in the " Food Plants of Scale Insects," 

 by Prof. T. D. A. Cockerell, published in the Proceedings of the U. 

 S. National Museum, Vol. XIX, p. 725 (1897). Many references 

 have been purposely omitted as they contained no additional informa- 

 tion, or gave only new food plants or habitats which were added 

 without efiving the references. 



