861 



organ clavate and pectinate, recurved, and of medium length; 

 interlamellar hairs subequal to lamellar hairs; rostral hairs 

 much smaller than these and very slightly curved. 



Abdomen large, almost spherical, hairless; pteromorphae 

 rudimentary; anal covers about twice as long as genital covers; 

 genital covers situated about three times their length in front 

 of anal covers. 



Legs subequal; femur of leg I extending to tip of rostrum, 

 tibia and tarsus subequal, genual a little less than half as long 

 as the tibia. 



Length, 0.70 mm.; breadth, 0.46 mm. 



Collected by the author at Areola, 111. Several specimens. 



Oribata arborea Banks. 



1895. Oribata arborea, Banks, Trans. Amer. Ent. Soc, Vol. XXII., p. 7. 



Light chestnut-brown; integument smooth. 



Cephalothorax half as long as the abdomen, triangular; la- 

 melhe long narrow blades, of about uniform width and about 

 two thirds as long as the cephalothorax; lamellar hairs straight 

 and apparently without barbs, about as long as the lamellae; 

 interlamellar hairs similar to lamellar hairs; antero-lateral 

 hairs but slightly curved and about three fourths as long as the 

 lamellar hairs. Pseudostigmata cup-shaped, slightly projecting; 

 pseudostigmatic organ clavate, recurved, and very slightly 

 barbed at the end. 



Abdomen two thirds as broad as long, hairless; pteromor- 

 ptue truncate anteriorly and not extending beyond the ante- 

 rior margin of the abdomen; anterior margin slightly emar- 

 ginate above; genital covers almost as long as the anal covers 

 but much narrower, situated about one and a half times their 

 length in front of the latter. 



Anterior pair of legs two thirds as long as the abdomen. 

 Tarsus and tibia of leg I subequal; genual one half as long as 

 the tibia. From a small tubercle on the distal end of the 

 tibia of leg I extends a long tactile bristle, longer than the 

 segment itself. Ungues tridactyle; dactyles unequal. 



Length, 0.45 mm.; breadth, 0.30 mm. 



