Ewing — Neiv North American Acarina, 75 



sessing four rather long bristles, three at the distal end of the segment 

 and one near the middle; about half a dozen other very minute bristles 

 present. Claw of tarsus I stout, somev.hat longer than the width of the 

 segment. Tibia of leg I almost as broad as long and possessing a long 

 tactile bristle about three times as long as the segment itself. 

 Length, 0.40 mm.; breadth, 0.22 mm. 



Under a log. Collected by the writer at Areola, 111. 

 This species is noted especially for the large size of the 

 bristles on the body. 



Rhizoglyphus Claparede. 



Integument not granular; mandibles chelate; suture dividing the 

 cephalothorax from the abdomen; only two large posterior bristles on 

 the dorsal surface of cephalothorax; ventral apertures small; male with 

 anal suckers; in some cases a dimorphic male may exist with the third 

 pair of legs enormously developed. Tarsi short, stout; with some stout 

 spines and distinct claws. 



One species. 



Rhizoi^lyphiis oblongiis n. sp. 



PI. XL f. 39. 



Dull, brov.nish grey; legs paler. 



Cephalothorax long, about twice as long as broad. Mandibles stout, 

 their length, as seen from above, equal to about one-third that of the 

 cephalothorax. Anterior bristles slightly curved, situated on the 

 anterior margin of the cephalothorax and extending to almost the tip 

 of the mandibles; the two posterior bristles as long as the cephalothorax 

 itself and situated near the lateral margins of the same; a very small 

 pair of bristles is present between the large posterior bristles. 



Abdomen large, almost twice as long as broad and possessing few 

 prominent bristles; the largest pair being the shoulder bristles, which 

 are almost as large as the posterior bristles of the cephalothora?:. 

 Besides the shoulder bristles there is a pair of lateral bristles about one- 

 half as long as the shoulder bristles situated about two-thirds the dis- 

 tance from the anterior to the posterior end of the abdomen, also a pair 

 of similar posterior marginal bristles and a pair of bristles situated 

 dorsally about their length from the posterior margin. 



Tarsus of leg I half as long again as the tibia; sense hair situated 

 about two-thirds its length from the proximal end of the segment. No 

 large spine near the sense hair, there is however a very small spine, 

 about two-thirds as long as the sense hair itself, situated approximate 

 to it on its inner side. Just above the tarsal claw is situated a very 

 large, stout spine about two-thirds as long as the claw itself; on the 

 inner margin of the tarsus about one-third the distance from the distal 

 to the proximal end of the segment is a small, sharp spine directed for- 

 ward; just posterior and dorsal to this spine is a long slender one 

 about three times as long; on the outer posterior aspect is situated a 

 small spine. Distally the tarsus of leg I bears two lateral and one 



