416 H. E. EWING. 



Dark brown; integument thick, leathery, rough, tuberculate. 



Cephalothorax triangular, about three-fifths as broad as long, dorso- 

 vertex very rough, the integument being thickened in places as to 

 form ridges. There is a pair of stout, short, curved, clavate anterior 

 lateral bristles which extend upwards and towards the median plane. 

 Pseudostigma low, cylindrical ; situated at the extreme, posterior latero- 

 dorsal aspect of cephalothorax ; pseudostigmatic organ short, strongly 

 clavate, about as long as femur one is broad. 



Cephalothorax about three-fifths as broad as long ; elongate and 

 pointed posteriorly; dorsum has four areas concentrically arranged 

 and at different levels in a stair-step fashion, the outer area being at 

 the bottom and the inner at the top ; areas of same shape which is that 

 of the abdomen itself. Three pairs of stout, clavate, bristles are situated 

 on the posteror margin of the abdomen near the median plane. The 

 inner pair is very large, being longer than the tarsus of leg four, mid- 

 dle pair not quite one-half as long as the median pair, the outer pair 

 is the smallest, being not quite as long as the middle pair ; abdomen 

 otherwise hairless. Ventral plate triangular, a little longer than broad ; 

 genital covers larger than anal covers, each about twice as long as 

 broad and with a straight median margin and a convex lateral margin ; 

 genital covers situated almost approximate to the anterior margin of 

 ventral plate and the anterior margin of the anal aperture ; anal covers 

 about three times as long as broad, much broader anteriorly than 

 posteriorly. 



Legs short and stout ; anterior pair not quite as long as abdomen ; 

 tibia a little longer than tarsus : each leg with several short, stout, usu- 

 ally slightly curved, clavate bristles. The tarsus of each leg has several 

 small, straight, simple hairs, and the tibia a few of such hairs. Unguis 

 stout, strong, tridactyle ; dactyles equal. 



Length, 1.04 mm. ; breadth, 0.52 mm. 



Under hickory bark. First collected by J. D. Hood, 

 Urbana, Illinois. Many specimens. 



Fam. HOPLODERMID^E. 

 With a specialized setae arising from a pore near each 

 postero-lateral corner of cephalothorax ; cephalothorax hinged 

 to abdomen and capable of being folded down over the ven- 

 tral surface of the same ; body compressed ; integument not 

 strongly chitinized. 



Gen. HOPLODERMA Michael. 



Unguis monodactyle ; genital and anal covers separated 

 from each other. 



