Vlll PREFACE. 



has been proposed that the species hitherto included 

 in the genus Lecanium should be referred to Coccus ; 

 Coccus to Dactylopius ; Dactylopius to Pseudococcus ; 

 Pseudococcus to PJienacoccus ; and Apterococcus to 

 Fons Colombia. All these alterations have been dealt 

 with in the Appendix, to which I must refer the 

 student for further particulars. 



It was originally intended to give a full bibliography 

 of the Coccidae, but, owing to the great number of 

 separate papers which have appeared in various 

 journals and other publications, it has been decided to 

 abandon the list. The student will, however, find the 

 references to all the important works and papers 

 which have been consulted given in connection with 

 the various genera and species which have been dealt 

 with throughout the work. 



Having completed my task, the very pleasant duty 

 devolves upon me of again tendering my most sincere 

 thanks to the Council of the Ray Society for their 

 kindness and generosity in undertaking the publica- 

 tion of this costly monograph. 



I beg also to acknowledge a further grant of 20 

 from the Royal Society, which has enabled me to make 

 extended journeys into various parts of the country, 

 thereby adding materially to our knowledge of the 

 distribution of the indigenous Coccidse. 



My special thanks are due to the Secretary of the 

 Ray Society, Mr. John Hopkinson, F.L.S., who has 

 undertaken the task of reading through my MSS. and 

 proofs, and has made suggestions which have proved 

 most valuable. I have also to thank Mr. R. McLachlan, 

 F.R.S., for looking through the final proofs. 



R. N. 



THE GROSVENOR MUSEUM, 

 CHESTER ; 



May '30th, 1903. 



