NEW AMERICAN ACARINA. 9 



Sea Cliff, N. Y. Uncommon, in moss ; to the naked eye it has a 

 bhack, shiny appearance. 



Oribatella, obesa nov. sp. — Length .6 mm. Reddish, legs yellowish, a 

 jiale spot at anterior edge of abdomen ; tectal plate not vei-y large, deeply bilobed. 

 each lobe slightly rounded and with a bristle at tip, superior bristles moderate, 

 suberect ; setae short, clavate ; alidomen broad, depressed, finely granulate, with 

 a few bristles, most numerous toward tip, no dark spots ; a small, oblong, light one 

 each side near base and three rounded ones near tip ; wings quite largti, nearly 

 semi-circular; venter smooth ; legs moderate, a plate behind and one in front of 

 anterior coxae. 



Two specimens, one Olympia, Wash. (Trevor Kincaid) ; the other 

 in a vial of »Sea Cliff things, but it may have gotten in by mistake. 



Oribsitella aqiiatica nov. sp.— Length .5.5 mm. Dark reddish, legs yel- 

 lowish, a pale spot at base of abdomen; body very broad, nearly circular, moder- 

 ately depressed, smooth ; tectal jilate short and broad, ending in front in four 

 slender spine-like projections, the lateral ones being sinuate and more closely ap- 

 pressed to the sides of the cephalothorax, the median or dorsal pair slightly 

 curved and with a bristle at tip ; superior pair of bristles long, curved forwards : 

 setae moderate, clavate : abdomen large and broad, anterior edge advanced in the 

 middle ; wings moderate, oblong ; venter smooth, genital opening not much more 

 than its length from the larger anal opening; coxal plate divided. 



Not nncommon, Sea Cliff, N. Y. This species lives on aquatic 

 plants, and can walk over the surface of stagnant water very readily ; 

 I have kept siiecimens in an aquarium for several months. There is 

 nothing pecidiar in the structiu'e of the feet. 



Oi'ibatella i^ignata nov. sp. — Length .45 mm. Dark reddish brown, legs 

 yellowish, a pale triangular spot at base of abdomen ; body moderately high, con- 

 vex, dorsum smooth ; tectal plate large, reaching to end of the cephalothorax, 

 triangular, sides slightly concave, truncate in front and deeply bifid, a short stitf 

 bristle at each corner of the lobes; superior pair of bristles long, curved, directed 

 forwards ; setae quite long, clavate ; abdomen longer than broad ; wings moder- 

 ately large, triangular, ])rojecting somewhat in front, lower margin rounded ; 

 venter smooth, genital opening about once and a half its length from the much 

 larger anal opening ; a dark line each side on the coxal plate ; legs moderate, a 

 little more hairy than usual. 



Two specimens, Sea Cliff, N. Y. 



Oribafella arinata nov. sp. — Length .55 mm. Dark reddish, legs yel- 

 lowish, a yellow s])ot at liase of abdomen ; body high, convex, smooth ; tectal plate 

 oblong, deeply cleft, end of each lobe rounded, a small bristle from each; superior 

 bristles moderately long, directed forwards ; setae quite long, clavate ; dorsum of 

 abdomen with a few indistinct short hairs ; wings large, somewhat oblong, with 

 a very large curved spine from the upper anterior margin ; venter smooth, genital 

 opening not quite once and a half its length in front of the anal opening: coxal 

 plate divided by a long dai-k line each side ; legs about as usual, a curved plate 

 behind anterior coxae. 



Sea Cliff, N. Y. Four specimens. 



TRANS. AM. ENT. SOC. XXII. (2) PEBEUAEY. 1895. 



