8 NATHAN BANKS. 



rior margin with two incisions, bearing above about thirty bristles, tliose near the 

 tip slightly longer than the others; wings moderate, somewhat triangular, 

 rounded, the lower margin incurved; venter quite roughly granulate, the genital 

 opening much more than its length in front of the larger anal opening ; two short 

 lines each side on the coxal plate ; legs short. 



Sea Cliff, N. Y. Quite coniinon, e^<pecially in sandy places, inider 

 dead leaves. Readily distinguished by its small size, bristly body 

 and yellowish color. 



ORIBATEI>L.4 nov. gen. 



The tec'tal ])late is large and joined to the cephalothorax only at 

 base, the apex free and usually divided into two or more hjbes or 

 spine-like projections. The body is more often bristly than in Ori- 

 bata, otherwise it is very similar to that genus. 



Though several species are known to me they are all moderately 

 rare, strongly contrasting in this respect with the abundance of 

 several species of Oribata. 



1. — With some bristles on abdomen > ~- 



No bristles on abdomen 4. 



2.— Tectal plate bidentate 3. 



Tectal plate quadridentate 4-dentata. 



3. — Bristles arising from dark spots, wing small, triangular bideiitata. 



Bristles not arising from dark spots, wing large, semi-circular obf»«a. 



4. — Wings armed in front with a large spine ariiiiita. 



Wings unarmed o. 



.5. — Tectal plate divided into four long pointed spines aquatica. 



Tectal jtlate divided into two truncate lobes sigiiata. 



Oribatella 4-cle»talla nov. sp. — Length .6 mm. Eeddish, legs paler, and 

 a triangular yellow spot at base of abdomen ; tectal plat« large, divided in front 

 into four long, equal spines, a long bristle each side at the inner base of the outer 

 spine, superior bristles shorter; setie of stigmata short; sides of head concave; 

 abdomen nearly circular, moderately high, base rounded, with about twenty-four 

 long, stifl" bristles ; wings large, finely reticulate, anterior margins finely dentate, 

 terminating below in a small spine ; venter smooth, genital opening about once 

 and a half its length from the equal anal opening ; coxal plate with a line each 

 side ; legs short, with stift' bristles. 



I have one specimen of this fine species from Sea Cliff, N. Y. 



Oribatella bidentata nov. sp. — Length .5 mm. Cephalothorax reddish, 

 abdomen nearly black, with a yellow spot at base, legs yellowish ; tectal plate 

 narrow, deeply bifid at tip, with a short, stifl' bristle at end of each projection ; 

 superior bristles long, erect ; setie quite long, clavate at tip ; abdomen depressed, 

 longer than broad, smooth, with about twenty black patches each giving rise to a 

 l)ristle ; wings moderate, triangular: venter smooth, genital opening not much 

 more than its length from the larger anal opening : coxal plate with a black line 

 each side ; legs very short and stout, femora broad, those of anterior pairs mar- 

 gined. 



