355 



12. Lamellae large, broad, three fourths as long as the cephalo- 



thorax virginica. 



Lamella? very small, short, about one fourth as long as the 



cephalothorax parvilamellata. 



VS. Abdomen hairless illinoisensis. 



Abdomen with prominent hairs banksi. 



Oribata emarginata Banks. 



1895. Oribata emarginata, Banks, Trans. Amer. Ent. Soc, V r ol. XXII., p. 7. 



Dark brown; integument very hard: surface smooth. 



Lamella? absent. Rostrum stout, with a rounded anterior 

 end; rostral hairs curved and pectinate; tectopedia blade-like 

 and two thirds as long as the rostrum; pseudostigmatic organ 

 clavate and pectinate, about as long as the tarsus of leg T; 

 interlamellar hairs stout and pectinate. 



Abdomen slightly pyriform and hairless; pteromorpha? 

 slightly pointed, extending forward almost to the tip of the 

 rostrum; anal and genital openings far apart; genital covers 

 about two thirds as long as the anal covers. Females with a 

 long, segmented ovipositor, which is often extended when the 

 mite is killed in hot water. This ovipositor is trilobed distally, 

 each fork bearing two large bristles. 



Legs subequal in length ; fourth pair longest; second pair with 

 very stout femora. First pair of legs twice as long as the ceph- 

 alothorax; tarsus the longest segment, bearing a large plumose 

 hair at a point about one third the distance from the proximal 

 to the distal end of the segment; tibia much shorter than the 

 tarsus and globose distally; genual as long as the tibia, but only 

 about half as broad; femur large; coxa small. 



Length, 0.89 mm.; breadth, 0.50 mm. 



Under logs and in rubbish. Collected by the writer at 

 Areola, LIrbana, Galesburg, Chicago, and Marshall, 111. Mr. 

 Banks has confirmed the determination of this species. 



Oribata rqbusta Banks. (PL XXXI1L, Fig. 4.) 



1895. Oribata rdbusta, Hanks, Trans. Amer. Ent. Soc, Vol. XXII., p. 7. 



Uniform light brown; integument thin and brittle. 



