FAMILY RICKETTSIACEAE 



1099 



numerous non-blood-suckiug insects as 

 well as lice and ticks. 



Cowdry (Arch. Path, and Lab. Med., 

 2, 1926, 59) lists seven species of arach- 

 nids and twenty-four species of insects 

 which are hosts to non-pathogenic rick- 

 ettsiae. 



Buchner, P. (Tier und Pfianze in Sym- 

 biose. Gebx-iider Borntraeger, Berlin, 

 1930, 900 pp.) Through the text, and 

 particularly on pages 300-664, the 

 rickettsia-like and bacterium-like micro- 

 organisms occurring intracellularly in 



insects and other small animals are dis- 

 cussed, principally from the viewpoint of 

 the biologist. 



Paillot, A. (L'infection chez les In- 

 sects, Paris, 1933, 535 pp.). Concerned 

 principally with bacterial infections of 

 insects, but also includes information in 

 intracellular symbiotes and rickettsia- 

 like and bacterium -like microorganisms. 



Steinhaus, Edward A. (Insect micro- 

 biology. Ithaca, 1946, 188-255.) Intra- 

 cellular bacterium-like and rickettsia- 

 like symbiotes are discussed. 



