406 H. E. EWING. 



as long as the anterior pair; fourth pair equal to the first pair. Tarsus 

 of leg one about two-fifths as long as the tibia ; tibia two-fifths as long 

 as the entire leg; antepenultimate segment very short, about one-third 

 as long as tarsus. Each of the legs bears a few short bristles ; none 

 of the segments swollen. 



Length, 0.64 mm. ; breadth, 0.44 mm. 



In moss. Collected by C. A. Hart at Carbondale, Illinois. 

 One specimen. 



This species differs from N. americanus Banks in many 

 ways. The second pair of legs instead of being equal to the 

 anterior pair are not over one-half as long ! None of the 

 tarsi are swollen in this species as in N. amer'icanus and none 

 of the legs have a long tactile bristle. 



Fam. RHYNCHOLOPHID^. 

 Palpus never geniculate or fitted for grasping prey, but 

 provided with a thumb at the distal end ; body well clothed 

 with hairs ; coxae arranged in groups ; cephalothorax on the 

 same plane with the abdomen ; mandibles styliform. 



Gen. RHYNCHOLOPHUS Duges. 

 Palpi large, composed of five segments ; mouth parts not 

 retractile ; dorsal groove prominent ; tarsus of leg one some- 

 times swollen. 



Two species. 



Key to species. 



Palpi about equal in length to the mandibles tumidllS. 



Palpi about twice as long as the mandibles longipalpus, 



Rliyncliolophus tumidus n. sp. 



(Plate XIV., Fig. 8.) 



Uniform bright red ; sparsely clothed with short clavate bristles ; 

 legs clothed with longer, simple bristles. 



Cephalothorax not demarcated from abdomen ; median groove ex- 

 tending as far as the eyes, expanded into a small triangular area 

 posteriorly, from which extends two simple bristles fully one-half as 

 long as the entire length of the groove ; anteriorly the groove is con- 

 tinued into a small tubercle as broad as high, from which extends four 

 prominent bristles each about one-third as long as the mandibles. A 

 single pair of eyes is present above the second pair of legs. Mandi- 

 bles as long as the palpi. Second segment of palpus one-half as broad 

 as long; third segment broader than the second, about two-thirds as 



