b NATHAN BANKS. 



Oi'ibata pratensis uov. sp. — Length .7 mm. Yellowish or reddish, legs 

 paler ; tectal plate broader than long, terminated by a transverse ridge, at each 

 anterior corner is a bristle, superior bristles long ; setae of stigmata very short, 

 capitate ; abdomen high, smooth, three small, smooth spots each side, the basal 

 one oblong ; wings small, about half as high as long, triangular ; venter smooth, 

 just in front of the anal opening there is the outline of a short, clavate figure ; 

 the genital opening fully twice its length in front of the larger anal opening ; a 

 black spot on each side of coxal plate. Legs moderate, the femora broad. 



Sea Cliff, L. I., N. Y. ; swept from grass in great numbers. 



Oribata afliiiis nov. sp. — Length .8 mm. This species has much the re- 

 semblance of 0. pratensis, having a high abdomen, small wings, broad femora, etc. 

 But it differs in a number of ways ; the tectal plate is about as long as broad at 

 base, it is not limited by a ridge ; there is a faint suture between the base of tec- 

 tal plate and the abdomen, in which are two round sjiots ; the smooth spots on the 

 abdomen are smaller and indistinct ; the wings are not half as large as in 0. pra- 

 tensis, being extremely small ; the setie are longer ; the genital opening is not quite 

 twice its length in front of the anal ; on the coxal ijlate there is a line each side. 



Washington, D. C. Many specimens under the loose bark of a 

 tree. 



Oribata magna nov. sp. — Length 1 mm. Eeddish, legs paler; tectal plate 

 quite long, no anterior ridge, only a bristle at each corner, no superior bristles ; 

 abdomen extremely high and convex, smooth, four small round spots on each 

 side, the three posterior fonniug a triangle; wings moderate, triangular, fully 

 half as high as long, tip rounded ; venter smooth, genital opening not quite twice 

 its length in front of anal ; a black spot each side on coxal plate ; legs moderate, 

 the femora broad, the posterior pairs distinctly margiued ; setse of stigmata mod- 

 erate, clavate. 



Sea Cliff, N. Y. Five specimens. 



By its large size and convex appearance it resembles Cephm iil- 

 tidus, but is readily distinguished by its wings, etc. 



Oribata moesta nov. sp. — Length .55 mm. Red-brown, legs yellowish, 

 have never observed a pale spot at base of abdomen ; tectal plate terminated each 

 side by a bristle, no anterior ridge, superior bristles (juite long, erect ; aljdomeu 

 but little convex, depressed, smooth, shining ; wings small, triangular, tip rounded, 

 nearly one-half as high as long, not projecting in front of abdomen ; venter 

 smooth, genital opening one and one-half times its length in front of the larger 

 anal opening ; coxal lines nearly complete ; legs short ; setse moderate, capitate. 



Sea Cliff, N. Y. Not uncommon on the ground. 

 Known by its small wings and flat body. 



Oribata depressa nov. sp. — Length .45 mm. Red-brown, no pale spot 

 above, legs yellowish ; cephalothorax short, tectal plate terminated each side by a 

 bristle, superior bristles moderate, erect ; setaj moderate in length, capitate ; ab- 

 domen smooth, depressed, plainly longer than broad ; wings large and long, pro- 

 jecting in front of the abdomen, twice as long as high, convex behind, iu front. 



