PREFACE. 
In preparing the series of articles which follow, the author has had 
in mind the needs of the student l)eginning a systematic study of the 
indigenous representatives of the Coccidie. Accordingly, to facilitate 
their use, these papers are now brought together under one cover, and 
are preceded by a brief introduction. For reference and explanation 
of terms, an index and glossary are added. Since the purpose of this 
work has been to treat of species occurring in a state of nature in 
this latitude, but little attention has been given to those fonns dwell- 
ing in greenhouses. 
In the study of this group, the student is urged to give special 
thought and care to technique of the microscopical pi’eparations. 
Obviously, well-prepared mounts are essential to ]U'oper anatomi- 
cal studies. The student should not bo satisfied with simple deter- 
minations of species, but should eoutinue the study of the individual 
representatives of each species, brought together in many cases from 
dift'erent localities and on different hosts, in order to comprehend the 
variations and gradations existing within the species. 
