PREFACE 



The following materials were originally collected for the use 

 of students in the indentification of coccids. They were based 

 upon printed descriptions and original studies of specimens. There 

 were, when the tables were first prepared, no extensive or limited 

 analyses that could be used for this purpose. The first plan was 

 to arrange analyses of all the genera and species of all the sub- 

 families, but it was soon found that this was impractical. The 

 first draft w^as prepared about fifteen years ago. This was later 

 greatly extended, modified, revised, and mimeographed for issu- 

 ance to students. 



The mimeographed edition contained the following preface : 

 ' ' The tables given herewith are compilations to facilitate the deter- 

 mination of species. In making the compilations, numerous studies 

 were made on the phylogeny of the different subfamilies, genera, 

 and species and the results of the studies thus made are embodied 

 herein. Although compilations from descriptions in the main, yet 

 they contain names not used elsewhere (all those marked MacG.) 

 and hence unpublished. The preparation of mimeographed papers 

 does not constitute publication according to the rules of systematic 

 zoologists. Hence these new names and this manuscript has no 

 standing in entomological literature. In justice to the writer, there- 

 fore, the names and tables given herewith should be considered the 

 personal property of the writer and are not to be referred to by 

 any person using the tables in any paper that may be published 

 until after the names and facts here given have been printed in 

 such a way by the writer as to be recognized as published by 

 zoologists." This statement is included in order to fix the status 

 of the mimeographed copies in case any of them should find their 

 way into libraries. 



Besides the preparation of the tables there was accumulated 

 from various sources in addition to my own studies upon speci- 

 mens, many facts bearing upon the preparation, anatomy, meta- 

 morphosis, and habits of coccids. These facts were presented to the 

 students in the form of a course of lectures. Most of the students 

 who have taken this coccid course have been provided with a set of 

 the mimeographed tables. I have had many requests from former 

 students and others to purchase the tables or asking for permis- 



V 



