MITES OF FAMILY CHEYLETIDAE — BAKER 269 



KEY TO THE GENERA 



1. Palpal tarsus with comblike and/or sicklelike setae 3 



Palpal tarsus with only simple setae 2 



2. Tarsus I without claws but with a rayed pulvillus Cheyletiella Canestriui 



Tarsus I with claws Neocheyletiella, new genus 



3. Palpal tarsus with both sickle- and comblike setae 4 



Palpal tarsus with 2 sickle- and no comblike setae ; hysterosomal shield only. 



Cheletoides Oudemans 



4. Palpal tarsus with 2 sickle- and 2 comblike setae 5 



Palpal tarsus with 2 sickle- and 1 comblike setae 15 



5. Leg I normal, with 2 claws 8 



Leg I a sensory organ, without claws 6 



6. With lenslike eyes 7 



Without lenslike eyes ; no claws or pulvillus on legs I Eutogenes, new genus 



7. Tarsus I attenuate at tip, with pulvillus but without claws. 



Cheletomorpha Oudemans 

 Tarsus I ending bluntly, without claws or pulvillus— Cheletogenes Oudemans 



8. With more than 1 dorsal shield 9 



With a single hysterosomal shield Cheletonella Womersley 



9. With 2 dorsal shields 10 



With 3 dorsal shields, 1 propodosomal and 2 hysterosomal. 



Cheletomimus Oudemans 



10. With a pair of lenslike eyes 11 



Without lenslike eyes 14 



11. Both sicklelike palpal tarsal setae normal 12 



One palpal tarsal sicklelike seta clavate ; dorsal body setae broad, reticulate ; 



dorsum of body may be reticulate Eucheyla Berlese 



12. Palpal claw with basal teeth 13 



Palpal claw toothed along entire inner margin Clieletophanes Oudemans 



13. Dorsal body setae squamiform Cheyletia Haller 



Dorsal body setae long, rodlike, ciliated Cheletophyes Oudemans 



14. Dorsal marginal setae squamiform ; dorsal setae cloudlike. 



Eucheyletia, new genus 

 Dorsal marginal setae featherlike, or pilose ; dorsal setae when present stag- 

 hornlike Cheyletus Latreille 



15. With 1 or more dorsal shields 16 



Without dorsal shields Chelacaropsis, new genus 



16. With propodosomal and hysterosomal shields 17 



With propodosomal shield only Cheletopsis Oudemans 



17. With the 2 dorsal shields separate 18 



With the 2 dorsal shields contiguous, covering entire dorsum and part of 



venter Chelonotus Berlese 



18. Anterior shield trapezoidal Acaropsis Moquin-Tandon 



Anterior shield pentagonal Cheletosoma Oudemans 



In A. M. Buitendijk's paper, "Voorloopige Catalogus van de Acari 

 in de Collectie— Oudemans" (Zool. Meded., vol. 24, p. 332, 1945), a 

 reference is made to C aenocheyletes franseni Oudemans, 1933. This 

 is probably a manuscript name, since I have been unable to find a pub- 

 lished description. 



