IV 
PREFACE. 
subjects and have asked that memoirs should be sent to the 
Zoological Record more freely than is at present the case. In 
the introductory observations prefixed to XIII. Insecta, some 
examples of the difficulties that have to be encountered are 
specifically mentioned. 
The list of periodicals has again undergone considerable 
augmentation, the titles of about 60 Journals having been 
added. The Editor thanks the Librarians who have assisted 
him in the editing of this list. Mr J. Walker, Oxford, has 
entirely revised the list as regards the Journals taken at the 
Radcliffe Library. 
Cambridge, 
November bth , 1903. 
D. SHARP. 
