In using this catalogue, the reader will find a large 

 number of strange "bacterial names which are not listed in 

 the latest (5th) edition of Bergey's Manual. It is un- 

 fortunate that so many undescribed species of "bacteria 

 exist. Regardless of the limitations of the available 

 descriptions of the "bacteria themselves, the importance 

 of the role of these "bacteria in the "biologic relation- 

 ships "between them and insects should not "be disregarded 

 and overlooked. It is hoped that many of these "bacteria 

 will "be re isolated and restudied so as to secure for them 

 a place in the accepted list of "bacterial species. Per- 

 haps the "bringing of these obscure names together in one 

 publication along with the names of tie well-known spe- 

 cies isolated from insects and ticks, will lead to a 

 uniformity, an enlargement, and an acceleration of study 

 and publication in this field, and will make for a more 

 thorough coverage of the literature of this subject. 



Since many of the interesting biologic relationships 

 between arthropods and bacterid in general could not be 

 handled satisfactorily in catalogue form, they have been 

 briefly discussed in the following section which summar- 

 izes the pertinent literature on these relationships. 



