Sept., 1409.] EwiNG : New American Oribatoidea. 121 



of the cephalothorax near the posterior margin, erect, short and very slightly pecti- 

 nate. Pseudostigmatic organ of medium length, clavate, recurved and slightly barbed. 



Abdomen as broad as long ; hairless. Genital covers rectangular, one and one 

 half times their length in front of the much larger anal covers. 



Tarsus of leg I slightly longer than the tibia. Claws tridactyle ; dactyles unequal. 



Length, 0.56 mm.; breadth, 0.43 mm. 



Under bark of a tree standing in the water, at the mouth of Spoon 

 River, 111. 



This species is related to Q. macroptera, but differs from it in 

 having a shorter and stouter pedicel to the pseudostigmatic organ, in 

 having much shorter tarsi for legs I and in not having the distal end of 

 the tibia of leg I swollen. It is also related to O. robusia Banks, but 

 differs from it in size, being much smaller; in not having the four 

 prominent bristles on the posterior margin of abdomen and in having 

 the superior bristles of cephalothorax much shorter. 



Oribata minuta, new species. (Plate III, Figs. 9 and 10.) 



Light brown ; integument rather thin, surface smooth. 



Cephalothorax broad and short. Lamellie situated laterally and adhering 

 closely to the cephalothorax. Dorso-vertex bearing a single pair of short, straight 

 hairs, situated near the posterior margin of the cephalothorax. Pseudostigmatic or- 

 gan with a rather long, recurved peduncle and an enlarged, long, tapering, serrate 

 head. 



Abdomen subglobose. Pteromorphae two thirds as long as abdomen, rounded 

 in front and extending beyond the middle of the cephalothorax. Genital covers two 

 thirds as long as anal covers and situated about one and one half times their length 

 in front of the anal covers. Abdomen hairless. 



Legs of medium size; femur enlarged. Ungues tridactyle. 



Length, 0.35 mm.; breadth, 0.24 mm. 



Under old boards. Collected by author, Areola, Illinois. Three 



specimens. 



Div. IL 



1. With a translamella. (Subdiv. («).) O. tatiiicisa s^. r\o\. 



Without translamella. ( .Subdiv. {b).) 2. 



2. Pseudostigmatic organ large, with a straight, simple posterior margin and a con- 



vex, pectinate anterior margin O. /le/vtna sp. nov. 



Pseudostigmatic organ smaller, clavate and simple O. enodis sp. nov. 



Oribata latincisa, new species. (Plate III, Fig. 11.) 



Dark reddish brown ; legs yellowish brown. 



Cephalothorax as broad as long. Lamella; almost as long as cephalothorax, 

 broadest at the anterior part where they end in large bilobed cusps ; translamella a 

 narrow blade on edge, one third as broad as long ; lateral lamellae present, crescent- 

 or sickle-shaped and not quite reaching to tips of lamellar cusps Prominent tecto- 



