412 H. E. EWING. 



anal covers. Anal covers almost approximate to posterior margin of 

 ventral plate. Abdomen hairless. 



Anterior pair of legs almost as long as abdomen ; tarsus and tibia 

 subequal, This species is remarkale in that all the femora possess a 

 chitinous, blade-like expansion. This chitinous blade is slightly cres- 

 cent shaped, without cusps and is attached to the whole length of the 

 femur. Unguis tridactyie. 



Length, 0.44 mm.; breadth, 0.22 mm. 



Under bark. Collected by the writer at Urbana, Illinois. 

 A single specimen. 



Oribata figurata n. sp. 



Plate XV., Figs. 17, 18.) 



Light brown; surface of integument smooth. 



Cephalothorax as broad as long; lamellae three-fourths as long as 

 cephalothorax, about the same width throughout ; lamellar cusps 

 prominent; translamellar a mere ridge. Lateral lamellae present, 

 about three-fifths as long as cephalothorax, curved towards the median 

 plane. Prominent, stout tectopedia for first pair of legs. Lamellar 

 hairs straight, pectinate, about one-half as long as the lamellae from 

 which they extend ; interlamellar hairs approximate to the posterior 

 margin of the dorso-vertex and similar to the lamellar hairs, but about 

 twice as long as the same, directed forwards ; anterior lateral hairs 

 stout, curved, and pectinate, about as long as the lamellar hairs. 

 Pseudostigma funnel-shaped, projecting abont one-half its length above 

 surface of cephalothorax ; pseudostigmatic organ about as long as 

 tibia of leg one, strongly clavate and directed forwards. 



Abdomen globose ; pteromorphae attached to the anterior two-thirds 

 of the lateral margin, truncate in front and not extending beyond the 

 anterior margin of abdomen, anterior free edge concave. Genital 

 covers subrectangular, almost as large as anal covers and situated one 

 and one-half times their length in front of the latter. Anal covers 

 situated almost approximate to the posterior margin of the ventral 

 plate. Abdomen hairless. 



Anterior pair of legs three-fourths as long as abdomen ; tarsus 

 slightly longer than tibia. Legs bearing prominent pectinate bristles. 

 No tactile hair on tibia one. Unguis tridactyie. 



Length, 0.39 mm. ; breadth, 0.30 mm. 



Under logs. Collected by the writer at Urbana, Illinois. 



One specimen. 



Oribata subaquila n. sp. 



(Plate XV., Fig. 19.) 



Chestnut brown ; integument of medium thickness, surface almost 



smooth. 



