X PREFACE. 



exotic specimens. Fortunately it has been found 

 necessary to do this in two or three instances only, 

 where full acknowledgment has been made. 



The terms used in this work are chiefly those em- 

 ployed by other students of the group, of which a full 

 glossary will be given in the second volume. 



The greater number of localities in this monograph 

 have been made by myself; when otherwise, the 

 name of the collector has been added in brackets. 



The Bibliography of the Coccidae will appear in the 

 second volume. But I wish here to draw special 

 attention to some of the principal authorities and their 

 publications. Signoret's Essai sur les Cochenilles is a 

 valuable though costly monograph, embracing all the 

 known species of Coccidae to the completion of its pub- 

 lication in 1876. The works of our late lamented 

 friend and colleague, Mr. W. M. Maskell, are a monu- 

 ment to his untiring energy in the researches of the 

 Australasian Coccidae; they are, needless to say, of 

 the utmost importance to the student. Dr. W. W. 

 Froggatt's papers on the gall-making Brachycelinae 

 of Australia are also of great interest and value, 

 embracing as they do descriptions of the most remark- 

 able sub-family of the Coccidae. 



In the United States the Reports of Professor ('mn- 

 stock are of much help, and beautifully illustrated ; 

 this may also be truly said of the Departmental 

 publications by the late Dr. C. V. Riley and the present 

 States Entomologist, Dr. L. 0. Howard. In the same 

 country Professor T. D. A. Cockerell's writings are of 

 a very extensive character, embracing a number of 

 valuable and important contributions. And quite 

 recently Mr. R. A. Cooley has commenced and partly 

 published a very important paper on the genus 

 Chionaspis, which is also profusely illustrated. Mr. 

 E. E. Green's 'Coccidae of Ceylon,' when completed, 

 will form one of the most valuable of modern works on 

 the group ; moreover it is beautifully and accurately 

 illustrated by his own masterly hand. Dr, Berlese, of 



