402 H. E. EWING. 



Gen. EUPALUS Koch. 

 Palpi composed of three segments, without spine-like 

 bristles ; one pair of eyes present. 

 Only one species described. 



Eupalus pectinatus n. sp. 



(Plate XIII., Figs. 1, 2.) 



Pale red. 



Cephalothorax not distinctly demarcated from abdomen. Anterior 

 bristles simple, situated about one-half their length from the anterior 

 margin of the cephalothorax. They are about as long as segment two 

 of palpus; posterior bristles small, almost erect, in the usual position. 

 This species is peculiar in that it possess a long, pectinate, specialized 

 seta arising from a pore situated in a funnel-shaped organ at the 

 postero-loteral aspect of abdomen. This structure is apparently the 

 same as that found in the Oribatidce. Mandibles slightly longer than 

 the palpi, hairless from above and ending in a claw. Segment one of 

 palpus small ; segment two about two-thirds as long as mandibles ; 

 segment three rudimentary and ending in a powerful, stout, outer claw 

 and a stout inner spine. Segment two bears four similar, simple 

 bristles on its dorsal surface ; segment three has two outer bristles, the 

 posterior is much the longer. 



Abdomen pyriform ; posterior end truncate. The abdomen has 

 several small bristles, including about half a dozen at the posterior 

 margin. 



Leg one about as long as abdomen ; tarsus three times as long as the 

 tibia. The last two pairs of legs are much stouter than the first two 

 pairs. Claws of last two pairs of legs twice as long as those of the two 

 anterior pairs of legs. The tarsi have at their tips, besides the claws, 

 caruncles, which are peculiar in consisting of three subequal prongs. 

 Legs all sparsely clothed with hairs of different lengths. 



Length, 0.38 mm. ; breadth, 0.25 mm. 



In moss. Collected by the writer at Mahomet, Illinois. 



Fam. CRYPTOGNATHID^E. 



Body plainly divided into cephalothorax and abdomen. 



Palpi without true thumb, never geniculate ; mouth parts 

 small ; last segment to the first pair of legs usually shorter 

 than the penultimate segment ; tarsi without suckers. Eyes 

 usually present. Mandibles chelate. 



Gen. CALIGONUS Koch. 

 Anterior pair of legs about equal to the other pairs ; femora 



