349 



Abdomen without wings; integument often rough or .sculp- 

 tured and sometimes ver}' little chitinized; legs fre- 



quentl}' stout or monilif(n-m Nothkid.e. 



The three families of the superfamily Orilxifoidra we 

 divide into 29 genera, which are distributed as follows: Ori- 

 li((fl(hr, 5 genera; Xaf/irii/a , 21 genera: and llnjiloilrniiidir. 8 

 genera. 



KEY TO THE GENEK,\ OF ORIBATID.E. 



1. Superior bristles of body spatulate; mandibles long and 



slender: integument sometimes rough or pitted. . Pelops. 

 Superior bristles never spatulate; integument smooth. . . 2. 



2. Tarsi of first pair of legs broad at the tip: pteromorphu' at- 



tached to the sides of the cephalothorax as well as to the 



abdomen (tymnob.\tes. 



Tarsi of first pair of legs tapering at the tip; pteromorphie 

 attached to the al)domen only 3. 



3. Claws of the tarsi tridactyle 4. 



Claws o"f tarsi monodactyle Oribatodks. 



4. Lamella' large, attached to the cephalothorax by their 



po.sterior margins only ( )kibatella . 



Lamellae moderate, attached to the cephalothomx by their 

 innei' margins Okibata. 



KEY to the genera OK XOTHRID/E. 



1. Mandibles rod-like, serrate Skrrakhs. 



Mandibles chelate 2. 



2. Last pair of legs distant from the others and saltato- 



rial Zetorchestes. 



Last pair not distant from the others, nor .saltatorial, l)eing 

 used for crawliug 3. 



3. Abdomen apparently divided into three parts by a i)air of 



oblitpie sutures passing backward from the posterior 

 edge of the cephalothorax to the middle of the lateral 



margins of the al)domen Trizetes. 



Abdouien without such obli(|ue sutures 4. 



4. Integument thill and little chitiiiizHd: variously colored . . V^. 



