375 

 Hypochthonius rufulus C. L. Koch. 



1835. Hypochthonius rufulus, C. L. Koch, Crust. Myr. Arach., Heft 3, Tab. 1!). 

 1855. Leisoma ovata, Nicolet, Arch. Mus. Paris, T. VII., p. 395, PL II., Fig. 5 



(Nymph). 



1888. Hypochthonius rufulus, Michael, Brit. Orib., Vol. I] p 534 P] XI 1\ 



Fig. 6-13. 

 1898. Hypochthonius rufulus, Michael, Das Tier., Lief. 3, p. 77. 



Body reddish; legs brown. 



Cephalothorax very long,two thirds as long as the abdomen. 

 Pseudostigmata short, cylindrical; pseudostigmatic organ long 

 and recurved, with a row of long teeth on the anterior side; a 

 pair of long bristles, almost as long as the pseudostigmatic or- 

 gan itself, in front of the pseudostigmata; palpi very prominent 



Abdomen broad, divided by a transverse suture into two 

 equal parts; flattened at the sides, forming blades which extend 

 almost the entire length of the abdomen; many large bristles. 



Legs short, stout, and subequal; segments cylindrical. 



Length, 0.66 mm.; breadth, 0.40 mm. 



Collected by the writer at Areola, 111. Two specimens. 



Family HOPLODERMIDjE. 



Cephalothorax hinged to the abdomen and capable of 

 being folded down upon its ventral surface so as completely 

 to hide the legs and mouth-parts; body generally compressed; 

 no tracheae present; mouth-parts large, mandibles powerful; 

 legs stout, never with swollen or moniliform segments; 

 cephalothorax frequently with a median carina. 



Genus Hoploderma Michael. 



Genital and anal openings situated together but with their 

 covers separate; ventral plate small or rudimentary; ungues 

 monodactyle. 



Two species: 



Total length of body not over 0.60 mm sphcerula. 



Total length of body over 1.00 mm dasypus. 



