Ewing — New North American Acarina. 73 
Dinychus ovatus N. Sp. 
Pte ALE fi 56: 
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 titia 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, III. 
ORIBATIDAE. 
Cephalothorax with a pair of specialized sete arising from two large 
pores situated in the dorsal integument near the posterior end; abdomen 
with chitinous wing-like expansions called pteromorphe; integument 
well chitinized and generally with a smooth surface. Nymphs without 
trachee or chitinized integument; adults with trachee 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 Nn. sp. 
PE AL S87, 
Light brown; integument smooth. 
Cephalothorax as broad as long. No true lamelle present but instead 
a pair of lateral lamelle 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- 
