Oribatei 391 



13. Hysterosoma without pteromorphs or wings 14 



Hysterosoma with distinct, although at times small, pteromorphs 

 or wings 21 



14. Chelicerae of usual shape — chelate — for chewing 15 

 Chelicerae long, narrow, knifelike, toothed on distal end Gustaviidae 



15. Fourth, and all, legs normal, not adapted for jumping 16 



Fourth pair of legs adapted for jumping; in death leg directed 

 forward Zetorchestidae 



16. Lateral\and posterior margins of dorsal shield not bent ventrally 17 



Lateral and posterior margins of dorsal shield bent ventrally, so 

 that large part of dorsal shield to be seen on ventral side 



Cymbaeremaeidae 



17. Legs III and iv on lateral margins of venter or not far from them 18 



Legs III and iv beneath venter and fairly distant from lateral 

 margins Liacaridae 



18. Legs of usual structure, shorter than body or not beadlike; pro- 

 podosoma with lamellae-like, ridged, or bladelike prominences 19 



Legs long, usually longer than body, or when not as long then 

 constricted in form of beadlike necklace, each segment strikingly 

 bulblike, swollen Belbidae 



19. With or without suture between propodosoma and hysterosoma; 

 with pseudostigmata and pseudostigmatic organs 20 



Without suture between propodosoma and hysterosoma; no pseu- 

 dostigmata or pseudostigmatic organs; no tectopedia ii and in 



Ameronothridae 



20. Dorsum of hysterosoma smooth or weakly punctate; femora i 

 and II never with strikingly long petiole Eremaeidae 



Dorsum of hysterosoma usually with strong sculpturing or weak 

 punctations; femora i and ii frequently with thin stalk or petiole 

 and swollen distally Carabodidae 



21. Pteromorphs not movably hinged 22 

 Pteromorphs movably hinged to body 28 



22. Pteromorphs attached to hysterosoma only; not covering large 

 portion of propodosoma 23 



