Sept., 1909.J EwiNG : New American Oribatoidea. 131 



longer than tibia. All the legs are clothed with rather stout, slightly curved pecti- 

 nate bristles. The posterior pair of legs are the longer. 

 Length, 0.74 mm.; breadth, 0.42 mm. 



Under bark of soft maple. Collected by J. D. Hood at Urbana, 

 Illinois. Many specimens. 



Genus HERMANNIA Nic. 



Abdomen not segmented ; dorsom of abdomen convex ; not carry- 

 ing nymphal skins; genital covers separate from anal covers; ventral 

 plate present. 



The single species described in this paper is one of three to pos- 

 sess a peculiar tubular projection on each side of the abdomen, the 

 function of which according to iSIichael is excretory. 



Hermannia subnigra, new species. (Plate V, Figs. 30 and 31. ) 



Dark yellowish brown ; integument thick and tuberculate. 



Cephalothorax pyramidal. Three pairs of bristles above ; the superior bristles, 

 rostral bristles and antero-lateral bristles. Superior bristles very stout, recurved and 

 pectinate ; rostral bristles similar to superior bristles ; antero-lateral bristles strongly 

 curved but not so stout as the rostral bristles. Pseudostigma cup-shaped, projecting ; 

 pseudostigmatic organ slightly recurved, clavate and about three fourths as long as 

 the femur of leg I. 



Abdomen broadly rounded posteriorly and peculiar in possessing on each side, 

 above the posterior pair of legs, an excretory tube. Excretory tube two thirds as 

 broad as long and with a projecting, recurved chitinous rim around the distal margin. 

 Dorsum of abdomen with four longitudinal rows of five bristles each and a few other 

 bristles around the margin of abdomen. Ventral plate shield-shaped, two thirds as 

 broad as long ; genital covers about two thirds as long as anal covers and situated one 

 half their length from the latter ; anal covers over twice as long as broad ; both anal 

 and genital covers tuberculate. 



Anterior pair of legs about as long as the abdomen ; tarsus longer than tibia ; 

 genual one half as long as tibia and as broad as long. Ungues monodactyle. 



Length, 0.56 mm ; breadth, 0.38 mm. 



Under logs and in trash. Collected by C. R. Crosby at Columbia, 

 Mo., and by the writer at Mahomet, 111. Many specimens. 



Genus NOTHRUS C. L. Koch. 



Abdomen not segmented ; dorsal surface of abdomen flat or con- 

 cave, never carrying nymphal skins; without tectopedia. 

 Nothrus quadripilus, new species. (Plate VL Fig. 32.) 



Uniform chestnut brown ; dorsal surface of the body reticulate, the dorsum of 

 the abdomen being more coarsely reticulate than the dorso-vertex of cephalothorax. 



