Eiving — Significance of Parasitism in Acarina. 63 



Permanent parasites. 



Gekobia (?). 



Parasitic Cheyletldae. 



Ixodidae. 



Listrophorldae. 



Analgesidae. 



Sarcoptldae. 



Cytolelchldae. 



Demodecidae. 



Erlophyldae. 

 Depending upon symbiotic relationship. 

 Mutualists. 



Some of the Gamasldae. 



Many of the Analgesidae. 

 Commensals. 



Picobia, Syringophilus. 



Many of the parasitic Gamasldae. 



Listrophoridae (in part). 



Most of the Analgesidae. 

 True parasites. 



Parasitic Tetranychidae. 



Gekobia. 



Trombidoidean larvae. 



Myobia, HarpyrUynclius, Psorergates. 



Ixodidae, Argasidae, Dermanyssldae. 



Cilliba (some species). 



Parasitic Tarsonemidae. 



Some of the Listrophorldae. 



Canestrinidae. 



Sarcoptldae. 



Cytolelchldae. 



Demodecidae. 



Erlophyldae. 

 Depending upon the blood relationship of the parasite to the host. 

 Host of organism affected not related to parasite. 



Nearly all of the parasitic Acarina. 

 Host or organism affected closely related to parasite. 



Larva of Smaris longilinealis on Oribata latincisa. 

 Organisms affected of the same species as the parasite itself. 



Host one of the parents. 



Rhyncholophus parviaetosua (?). 



