Ewing — New North American Acarina. 73 



Dinycbus ovatus n. sp. 



PL XL f. 36. 



Dull pink; legs more uniformly colored than the body. 



Body two-thirds as broad as long, very broadly rounded behind and 

 pointed in front, broadest at the insertion of the last pair of legs. Body 

 with a few fine hairs. Peritreme straight with the exception of a single 

 outward loop near the middle. 



Anterior pair of legs a little over one-third as long as the body and of 

 almost uniform width throughout; tarsus one and a half times as long 

 as the tibia and genual combined, almost hairless on the inner margin 

 but with a tuft of hairs on the outer distal aspect; tibia slightly longer 

 than the genual; femur twice as long as the genual. Last three pairs 

 of legs subequal; posterior pair extending to the posterior margin of 

 the abdomen. Claws of the last three pairs of legs moderate but situ- 

 ated on long pedicels; claws of the anterior pair of legs weak. The last 

 three pairs of legs are provided with a few small, short but sharp spines. 



Length, 0.50 mm.; breadth, 0.38 mm. 



Under a log. Collected by the writer at Urbana, 111. 

 Oribatidae. 



Cephalothorax with a pair of specialized setee arising from two large 

 pores situated in the dorsal integument near the posterior end ; abdomen 

 with chitinous wing-like expansions called pteromorphse; integument 

 well chitinized and generally with a smooth surface. Nymphs without 

 tracheae or chitinized integument; adults with tracheae opening at the 

 acetabula of the legs. 



This family is the same as the division Pterogasterea of 

 some authors and the same as the subfamily Oribatinae of 

 Michael in '*Das Tierreich " 3. 1898. 



Oribata Latreille. 



Abdomen with chitinous wing-like expansions and bearing no spatu- 

 late bristles; lamellae attached to the cephalothorax by their inner mar- 

 gins; tarsi with tridactyle claws, tarsus of leg I never broadened at its 

 distal end. 



One species. 



Oribata oblonga n. sp. 



PL XL f. 37. 



Light brown; integument smooth. 



Cephalothorax as broad as long. No true lamellae present but instead 

 a pair of lateral lamellae which closely adhere to the integument. Lamel- 

 lar hairs slightly curved and slightly pectinate, about one-half as long 

 as the cephalothorax itself; antero-lateral hairs similar to lamellar hairs 

 but smaller. Pseudostigma cup-shaped, slightly projecting; pseudo- 



