498 PROCEEDINGS OF THE ACADEMY OF [NoV., 



othorax triangular, with a broad lamella each side, broader near tip 

 than at base, and the tip trilobed, the middle lobe giving rise to a 

 curved, simple bristle; a pair of smaller bristles on tip of head. Supe- 

 rior bristles long and rather thick. Seta about one-half the width of 

 the cephalothorax, and clavate at tip. Abdomen nearly circular in 

 outline, not very high, above densely and roughly reticulate with rather 

 heavy ridges, with ten pairs of thick bristles, all minutely barl3ed ; one 

 on each shoulder, two each side back and inward from this, three in a 

 submarginal row on each posterior side, and four each side on posterior 

 margin, two of them being near the tip, and rather more clavate than 

 the others. Legs rather slender, with hairs in usual arrangement, 

 long ones from tip of tibia and near middle of tarsus. Coxse separated, 

 but coxse II united on the median line; coxse III and IV very short, 

 especially the latter, these giving room for the genital aperture, 

 which is not one-half its length in front of the much larger anal 

 opening ; venter finely irregularly rugose. 



Length .65 mm. 



One specimen from Blue Hill, Mass., October. 



Oribata puritanioa n. sp. 



Color, dark red brown, legs paler. Cephalothorax triangular, sur- 

 face smooth, two pairs of curved bristles near tip, an erect bristle near 

 base of each pseudostigmatic organ, the latter straight, thick, and 

 nearly as long as width of cephalothorax at that point. Abdomen 

 globose, smooth, with five pairs of stout, fusiform bristles above; a 

 basal pair pointing forward on extreme front margin of abdomen, the 

 others behind in a submarginal row each side; a pair of longer, cur\'ed, 

 simple bristles at tip. Venter smooth; genital and anal apertures 

 touching; anal plates with two or three striae, and each aperture with 

 two simple bristles each side, and two behind anus. Sternal plate with 

 a broad, deep furrow each side. Legs slender; I barely longer than 

 body, IV plainly longer; joints swollen at tips, and each with several 

 long, curved bristles near tip; tarsi very slender; but one claw. 



Length 1 mm. 



One specimen from Middlesex Fells, Mass., October. 



Oribata longiseta n. sp. 



Color, pale yellowish brown. Surface above and below smooth. 

 Cephalothorax with an apical pair of short bristles, and a stout black 

 bristle each side on vertex, near the pseudostigma. The pseudostig- 

 matic organ, long and slender, with a cm-ved and barbate tip, plainly 

 longer than width of cephalothorax. Abdomen globose, with scattered 



