NEW AMERICAN ACARINA. I 



and beneath, no emargination ; venter smooth, genital opening about twice its 

 length in front of anal opening ; a line and a spot each side on coxal plate ; legs 

 short. 



One sj)ecimen, Sea Cliff, N. Y. Differs from 0. robuda in smaller 

 size, flat body, more rounded wings, and absence of a pale sjaot. 



Oribata robusta nov. sp. — Length .75 mm. Reddish brown, legs yellow, 

 a small white spot at base of abdomen ; tectal plate terminated each side by a bristle, 

 .superior bristles erect; setse clavate, with a quite long stalk; abdomen convex, 

 highest at about the middle, smooth ; wings very large and long, broadly rounded 

 behind and below, entire, projecting much in front of the abdomen and obtusely 

 pointed ; venter smooth, genital opening twice its length in front of the very 

 much larger anal opening ; coxal plate each side with a line broadest at the outei' 

 end ; legs moderate. 



Three specimens from Sea Cliff, N. Y. ; two from Ft. Lee, New 

 Jersey ; and one from Washington, D. C. Distinguished by the 

 shape of its large wings, and by its long setae. 



Oribata emargiiiata nov. sp. — Length .75 mm. Black, yellowish at base r^ 

 of abdomen and cephalothorax, tips of legs yellowish, femora often whitish; 

 young specimens more reddish ; cephalothorax short and convex, more steep than .o;-!^ 

 in allied forms; tectal plate terminated each side by a bristle; superior bristles J 

 short, erect; setfe moderate, clavate; abdomen broad, high, convex, smooth, shin- i 

 ing, two incisions on anterior margin ; wings large, somewhat rectangular, pro- 

 jecting in front of abdomen, anterior and posterior sides oblique and convex, -- c?~~ 

 rounded beneath on posterior part, strongly emai'ginate a little in front of middle, ^ 

 venation often quite distinct ; venter smooth, genital opening about once and a T 

 half its length in front of the larger anal opening ; a line on each side of coxal j^ 

 plate ; legs as usual. 



Not very common, in moss. Sea Cliff, N. Y. ; Chicago, 111. ; Brazos 

 County, Texas. Easily recognized by its large, emarginate wing and 

 dark color. A male adult is somewhat smaller. 



Oribata arborea nov. sp. — Length .6 mm. Yellow, or reddish brown, 

 often with a white spot at base of abdomen ; body moderately convex and high, 

 highest behind ; tectal plate terminated each side by a bristle, superior bristles 

 moderate, erect ; setfe very short, clavate ; abdomen smooth, sometimes showing 

 an oblong spot at base ; wings as high as long at base, tapering each side to the 

 rounded tip ; venter quite smooth, genital "opening once and a half its length in 

 front of the much larger anal opening, a short traufsverse line a little in front of 

 anal opening, two lines each side on coxal plate ; legs about as usual, posterior 

 femora broad. 



Sea Cliff, N. Y. Common on cedar and peach trees. Readily 

 distinguished by the shape of the wings and by the very short setse. 



Oribata hirsiita nov. sp. — Length .4 mm. Wholly pale brownish yellow ; 

 cephalothorax triangular, convex, two superior bristles and two marking its tip ; 

 setfe short, capitate ; abdomen not high, a little longer than broad, smooth, ante- 



TKANS. AM. ENT. SOC. XXII. JANUARY, 1895. 



