54 Acarology 



Coxae immovable, arranged radially; legs stout; parasitic on bats 



Spinturnicidae 



8. Forked seta on palpal tarsus with more than two tines 10 

 Forked seta on palpal tarsus with two tines 9 



9. Dorsal plate entire or divided into large anterior and small pos- 

 terior plate 16 



Dorsal plate divided into two subequal plates that cover most of 

 dorsum Ascaidae 



10. Forked seta on palpal tarsus with three tines 11 

 Forked seta on palpal tarsus with four tines Veigaiaidae 



11. Epigynial plate without pointed apex thrust between pair of meta- 

 sternal plates 12 



Epigynial plate with pointed apex thrust between pair of meta- 

 sternal plates Parasitidae 



12. Leg I similar to other legs 13 



Leg I reduced, thin, without typical pretarsus, caruncle, or claws 



Macrochelidae 



13. Females with parapodal, peritremal, and metapodal plates not 

 fused and not extending posteriorly lateral to ventral plate or all 

 lateral plates fused with ventral plate 14 



Parapodal, peritremal, and metapodal plates fused and extend be- 

 hind coxae IV lateral to ventral plate Pachylaelaptidae 



14. Dorsal plate entire 15 

 Dorsal plate divided into two Gamasolaelaptidae 



15. Pretarsus and caruncle of leg i similar to those of other legs 



Neoparasitidae 



Pretarsus and caruncle of leg i reduced, not like other legs 



Pseudoparasitidae 



16. Tritosternum present with lacinae in females 20 

 Tritosternum absent or reduced without lacinae in females 17 



17. Chelicerae reduced or non-chelate except for few parasites of nasal 

 cavities of birds; males without apophyses on leg ii 18 



Chelicerae chelate; parasites in the external auditory meatus of 

 cattle and antelopes; basal portion of tritosternum reduced or lack- 

 ing in females, males with apophyses on leg ii Raillietidae 



